Barrie Home Inspector

Home Maintenance and Tips for Home Owners

Tag: concrete

Insulated Concrete Foundations “ICF”

Basements

Insulated Concrete Foundations “ICF” have interlocking forms that are dry stacked and then they are filled with concrete. These forms lock together much like a Lego brick and can be used to form the structural walls and/or floors of a building.

What is the best ICF system? There is no front runner in design when it comes to choosing a ICF system. Consumers typically look for the number one rated product when looking to make a purchase . The buying public strives to have the best product at the best price. As for ICFs, it is obvious that each individual ICF building system has different properties that deliver different benefits to the consumer. Some have thicker insulation than others. Some are connected with metal ties, others with plastic ties. Some systems are stacked like building blocks, others require assembly. Any correctly installed ICF product will ensure that the customer is happy with his choice.

ICF FormsThe most common ICF are manufactured out of Polystyrene Foam but they can also be manufactured out of Polyurethane Foam ,Cement-bonded wood fibre or Cement-bonded polystyrene beads. Once the forms are formed together, re-bar is usually added to give the concrete flexural strength and then the concrete is pumped into the cavity to form the structural element of the walls. The forms are filled in 1-12 foot “lifts” to manage the concrete pressure and reduce the risk of blowout . Once the concrete has cured , the forms are left in place permanently.

Here are some of the benefits in building with ICF:

ICF building are much more energy efficient then those built with traditional construction methods.

The form material allows you to easily add electrical and plumbing systems.

ICF has high sound absorption which helps produce peace and quiet which is not the case with typical wood construction

The longevity of ICF products provides a higher re-sale value in most Real Estate markets.

Un-like wood foundations which can develop problems When wet , concrete and polystyrene do not rot.

There are no problems with insect infestation or termites using ICF products.

Using ICF building products has shown to reduce heating and air conditioning costs by 50-70%

ICF creates a structural concrete wall that is up to 10 times stronger the a wood framed structure

As in any product there are some drawbacks to using ICF construction, which are;

Adding widows,doors or utilities after the building is complete requires concrete cutting tools which makes it harder to do although it does not require the traditional steel lintels to support the new opening

Building with ICF can increase home building costs by 2 to 3 %

Minor problems with interior humidity have been know to happen during the first couple weeks as the concrete is curing. Residential dehumidifiers are an easy solution to the problem.

ICF-designThe exterior foam insulation provides easy access for groundwater and insects in polystyrene based forms. To help prevent these problems, some manufacturers make insecticide treated foam forms and promote methods for waterproofing them.

Building with ICF can sometimes add 3-5% in construction costs compared to using wood frame, however the energy savings will usually result in much lower utility costs. Building with ICF below grade for typical basement forming should come in at about 40% less due to the labour savings from combining multiple steps into one. Above grade construction is a little more expensive but it becomes cost effective when adding large openings. In wood frame buildings, large openings require large headers and support posts but in ICF additional re-bar is all that is typically needed.

Understanding Your Septic Tank

Plumbing

Understanding Your Septic Tank – Information on the construction, operation and maintenance of your rural homes septic tank system.

Septic TankThe septic tank is buried, watertight container typically made of concrete, fiberglass, or polyethylene. It holds the wastewater long enough to allow solids to settle out, forming sludge, and oil and grease to float to the surface as scum. It also allows partial decompositions of the solid materials. Compartments and a T-shaped outlet in the septic tank prevent the sludge and scum from leaving the tank and traveling into the leach field area.The most common leach field consists of a series of trenches containing perforated pipe surrounded by septic rock, or gravel, and covered with mesh and dirt. The effluent entering the leach field is partially absorbed into the soil and partially evaporated. the leach field should not be driven on or covered by a driveway or patio.

If your home‘s plumbing system does include an on-site septic system, it is incredibly important to be aware of the signs of possible damage, along with the maintenance needed to prevent it. A damaged or clogged septic system can be costly to repair. It can also impose possible health risks for homeowners, tenants and neighbors. A failing septic system could be responsible for releasing wastewater and harmful bacteria and viruses, including E. coli.

There are many different types of septic systems ranging from what are called conventional in-ground systems to sand mounds and from spray irrigation systems to stream discharge systems. There are also seepage pits, cesspools, and homemade systems. This booklet is not intended to cover every situation, but is intended to give the homeowner an understanding of the concept of how a septic system works and a better understanding of a septic inspection.

The in-ground type of septic system uses a series of perforated pipes located below the ground surface. These pipes are placed in a bed of crushed stone or aggregate. The sewage flows over the crushed stone or aggregate into the underlying soil. The condition of this soil determines how well your septic system will operate and how large the absorption area needs to be. If the absorption area is too small and the soil is too tight as with clay soils, the liquid cannot soak into the soil fast enough causing the waste to either back up into the home or emerge at the ground surface. An early sign of waste emerging at the surface is “lush growth.” The saying “that the grass is always greener over the septic tank” isn’t true when it comes to a properly operating septic system.

How often should a septic tank be cleaned or pumped? The frequency for pumping a septic system depends on a number of factors; the average frequency is between two and four years. You can, in some cases, abuse a septic system and neglect to pump it for 10 or 20 years without any apparent problem. This would be like driving your automobile for 50,000 miles without changing the oil. You might get away with it, but you would certainly cause undue wear and tear on the engine. The same is true with a septic system. You may get away with not pumping the system for many years, but you will pay for it in the end by having to replace the absorption area.

When the soil conditions are right, an area of active microorganisms is formed where the waste enters the soil. As the waste slowly percolates through the soil the microorganisms continue to grow and feed on the harmful bacteria and viruses in the septic waste. The underlying soil continues to absorb and filter the waste. Four feet of soil is all that is needed to treat the septic waste in good soil conditions.

Concrete – Strength in Knowledge

Basements, Exterior

Concrete – Strength in Knowledge.  Concrete is used more than any other man-made material in the world.  As of 2006, about 7.5 billion cubic meters of concrete are made each year-more than one cubic meter for every person on Earth.

In evaluating concrete problems, one of the important decisions home inspectors must make is determining whether a problem is the result of conditions that have stabilized with a low chance of continuing future problems, or whether the conditions that caused the problem are such that there is a high probability that problems will continue or worsen.

Concrete powers a US $35 billion industry, employing more than two million workers in the United States alone. More than 55,000 miles (89,000 km) of highways in the United States are paved with this material. Reinforced concrete, prestressed concrete and precast concrete are the most widely used types of concrete functional extensions in modern days.

Concrete, as the Romans knew it, was a new and revolutionary material. Laid in the shape of arches, vaults and domes, it quickly hardened into a rigid mass, free from many of the internal thrusts and strains that troubled the builders of similar structures in stone or brick.  Modern structural concrete differs from Roman concrete in two important details. First, its mix consistency is fluid and homogeneous, allowing it to be poured into forms rather than requiring hand-layering together with the placement of aggregate, which, in Roman practice, often consisted of rubble. Second, integral reinforcing steel gives modern concrete assemblies great strength in tension, whereas Roman concrete could depend only upon the strength of the concrete bonding to resist tension.

Combining water with a cementitious material forms a cement paste by the process of hydration. The cement paste glues the aggregate together, fills voids within it and allows it to flow more freely. Less waterin the cement paste will yield a stronger, more durable concrete; more water will give a freer-flowing concrete with a higher slump. Impure water used to make concrete can cause problems when setting or in causing premature failure of the structure. Hydration involves many different reactions, often occurring at the same time. As the reactions proceed, the products of the cement hydration process gradually bond together the individual sand and gravel particles and other components of the concrete, to form a solid mass.

Plastic cracking occurs prior to concrete curing. Autogenous shrinkage is caused by internal drying.  Since there is no loss of water to one exposed surface, autogenous shrinkage is more uniform than plastic shrinkage. However, tensile stresses still develop, and embedded steel can cause anomalies in an area of concrete with relatively uniform stress. These anomalies can cause variations in stress within the concrete that are relieved by cracking.  Autogenous shrinkage cracking will be shallow and is not a structural issue. The cracks may look similar to those formed during plastic shrinkage and are often propagations of cracks created during plastic shrinkage.

The advantage to inspectors in being able to accurately determine the source of cracking is in understanding whether the condition that caused the cracking has stabilized so that it is no longer likely to cause additional cracking or encourage the propagation of existing cracks. Many cracks, like those caused by concrete shrinkage, are shallow cracks caused by forces that allow conditions to stabilize relatively quickly and do not lead to structural problems. Others, like those caused by soil subsidence or changes in soil volume, are caused by forces that can continue to affect concrete for a long time. This long-term instability can continue to cause serious structural problems over the long term.

When investing in a new property it is important to have the building inspected by a qualified residential or commercial inspector.  Visit www.barrie-home-inspector.com to learn more about the Barrie Home Inspector, when purchasing Commercial or Residential Properties.  With over 4,000 inspections, experience and knowledge can help protect your investment.

Concrete – Supporting Your Home

Basements, Exterior

Concrete – Supporting Your Home. The word concrete comes from the Latin word “concretus” (meaning compact or condensed), the perfect passive participle of “concrescere”, from “con-” (together) and “crescere” (to grow).  Most information available about concrete is written for contractors, for those who design concrete mixes, and for those who perform invasive testing.

In evaluating concrete problems, one of the important decisions home inspectors must make is determining whether a problem is the result of conditions that have stabilized with a low chance of continuing future problems, or whether the conditions that caused the problem are such that there is a high probability that problems will continue or worsen.

Different factors can affect concrete and the problems that inspectors will see.  How concrete hardens, strengthens and the qualities of its surface depend on a number of things, including the properties of its constituent materials.  Although Portland cement is the most commonly used binder, pozzolans may be substituted. Pozzolans are materials that, in addition to undergoing primary hydration, undergo a secondary hydration, producing a gel that fills tiny voids between cement particles, making concrete less porous and less likely to absorb moisture or chemical solutions that can damage concrete or steel reinforcement.

The constituent materials which are included in the mix, their proportions, the order in which they are combined, the length of time and method by which they are mixed, and the length of time between mixing to placing all affect the quality of concrete. With each decision and operation, there is a chance that mistakes will be made. The environmental conditions that exist during placing, finishing and curing concrete will have an effect on how it develops. The ground and air temperatures, wind speed, cloud cover, and the absorbent qualities of the substrate will affect newly placed concrete.

When initially mixed together, Portland cement and water rapidly form a gel, formed of tangled chains of interlocking crystals. These continue to react over time, with the initially fluid gel often aiding in placement by improving workability. As the concrete sets, the chains of crystals join and form a rigid structure, gluing the aggregate particles in place. During curing, more of the cement reacts with the residual water (hydration).  This curing process develops physical and chemical properties. Among these qualities are mechanical strength, low moisture permeability and chemical and volumetric stability.

Cracks that appear before the concrete has hardened are called plastic cracks.  Plastic cracks are typically due to poor mix design, placement practices or curing methods, and may also be caused by settlement, construction movement, and excessively high rates of evaporation. Cracks that appear after concrete has hardened can have a variety of causes, and sometimes have more than one cause.

Plastic shrinkage is shrinkage caused by the loss of water to the atmosphere. Autogenous shrinkage is shrinkage that takes place with no loss of water to the atmosphere.  Autogenous shrinkage is caused by internal drying, with water being absorbed by the constituent materials in the concrete.  As the long-term chemical hydration process continues – and it can continue for many years — water in the pores within the cement paste is absorbed, and the pores are filled, to some degree, by materials produced during hydration. This process leads to decreased permeability and increased strength and durability of the cement paste. Absorption of water from the pores also causes shrinkage.

When purchasing a new property it is important to have the building inspected by a qualified residential or commercial inspector.  Trust the Barrie Home Inspector for your Residential or Commercial Inspections.  Visit www.guaranteedresidentialinspections.com for more information. As a Certified Building Code Official with over 4,000 inspections your investment will be in good hands.  Experience and knowledge can help protect your investment.

Masonry Block – Building Tips

Basements, Exterior

Masonry Block – Building Tips. Every block wall-regardless of height or length-should be placed on a secure footing of poured concrete. A block barbecue grill or outdoor fireplace requires a large concrete pad as a footing. The footing must extend down beyond the frost line to prevent heaving in the winter.

For a footing poured in an area where drainage is a problem, lay a drain line along the outer edge of the form. Allow for a drop of about 1″ for each 20′ of drain line. Backfill over the drain line with about 12″ of crushed stone or gravel. In Ontario this is mandatory and must be installed for any building of 100 square feet in size.

Building exact corners is the most important construction of a masonry wall as corners will guide the building of the rest of the wall. A corner pole will make the job easier. A corner pole is any type of post which can be braced into a true vertical position and which will hold a taut mason’s line without bending. Two such poles are set up, one on each corner, with the mason’s line stretched between them. Corner poles for block walls should be marked every 4 to 8 inches, depending on how high the material is with which you are building the wall. Such marks must be absolutely level when the mason’s line is stretched between them.

Set the corner block first. Be sure you are using the correct block. Check the starting corner block, both horizontally and vertically, and take time to get it positioned correctly. All other blocks will align with this starter block, so it’s very important to set it exactly. Follow this same procedure as you reach the other corners, laying the first course out about two or three blocks in each direction. Tie a line between two bricks and stretch it between the two corner blocks on the first course.

Corners and lead blocks are generally built 4-6 rows high, with each course being stepped back one block from the course below, creating a pyramid effect. The wall alignment, plumb and level should be checked on these corners before completing the wall. If everything checks out fine, it is now time to fill in each course between the corners.

Because they can be adjusted in size slightly, mortar joints provide some layout flexibility. While the ideal mortar joint is 3⁄8 inch wide, masons routinely shrink joints to as small as 1⁄4 inch or stretch them to as large as1⁄2 inch. Joints that fall out- side this range are unsightly and, with a few small exceptions, prohibited by most building codes.

The Barrie Home Inspector uses his training to ensure every building inspected meets or exceeds the required building code practices. As a Certified Building Code Official he is one of the few Barrie Home Inspector’s with Ontario Building Code training in both Part 9 and Part 3 of the Building Code.

Bricks for Homes and Buildings

Exterior

Bricks for Homes and Buildings. In the past, bricks came in many different shapes and sizes, but today’s modern bricks tend to be a standard size of around 8″ x 4″ x 2″. They demonstrate a wide variety of textures, colours and finishes from yellows, reds and purples, to smooth, rough and rustic. These are due to the mineral variations found in the clay, and the method of manufacturing.

Raw surface clay and shale materials are taken from the ground in a process that is called winning. Materials are then carefully blended to control the quality, color and consistency of the desired finished product. The material is then formed by adding water and mixing materials in a pug mill. After mixing, the pugged clay is forced through a die creating a long extruded column of clay which is then wirecut to size. The material is then carried by conveyor systems into the firing kiln where it is first predried, and then carried through the firing stage of the kiln where temperatures can reach nearly 2000 degrees Farenheit. The brick can then be cubed and stored for shipping.

Bricks for building may be made from clay, shale, soft slate, calcium silicate, concrete, or shaped from quarried stone. However, true bricks are ceramic, and therefore created by the action of heat and cooling. Clay is the most common material, with modern clay bricks formed in one of three processes – soft mud, dry press, or extruded. Bricks are used for building and pavement. In the USA, brick pavement was found incapable of withstanding heavy traffic, but it is coming back into use as a method of traffic calming or as a decorative surface in pedestrian precincts. For example, in the early 1900s, most of the streets in the city of Grand Rapids, Michigan were paved with brick. Today, there are only about 20 blocks of brick paved streets remaining.

Solid brickwork is made of two or more layers of bricks with the units running horizontally (called stretcher bricks) bound together with bricks running transverse to the wall (called “header” bricks). Each row of bricks is known as a course. The pattern of headers and stretchers employed gives rise to different bonds such as the common bond (with every sixth course composed of headers), the English bond, and the Flemish bond (with alternating stretcher and header bricks present on every course). Bonds can differ in strength and in insulating ability. Vertically staggered bonds tend to be somewhat stronger and less prone to major cracking than a non-staggered bond.

Bricklaying Terms. Before beginning any of the bricklaying projects, study the following terms and their definitions. This will help you understand the various brick positions and patterns, as well as the typical mortar joints used. Bull Header. A rowlock brick laid with its longest dimensions perpendicular to the face of the wall. Bull Stretcher. A rowlock brick laid with its longest dimension parallel to the face of the wall.

Bricks are a versatile and durable building and construction material, with good load-bearing properties, high thermal mass and potential low energy impact. In the case of simple earth bricks such as adobe and CEBs, they measure high on the sustainability index, being made from locally available (and abundant) materials of clay, sand, and water, using low technology compression equipment, solar energy or kilns. While modern methods of brick construction have a much lower sustainability index, the UK brick industry has developed a strategy to minimize its environmental impact and increase its energy efficiency and use of renewable energies. Overall, bricks are a good example of a sustainable building practice and are currently gaining in popularity around the world.

Innovation in brick and block building is moving forward – thin joint mortar allows the depth of the mortar to be reduced from l0mm to just 2mm increases the speed of construction. Thin-joint system improves thermal insulation and air tightness of construction and increases ease of installation – thin joint mortar can be laid twice as fast as traditional mortar.

Your Home’s Structure

Exterior

Your Home’s Structure.  In North America, modern house-construction techniques include light-frame construction (in areas with access to supplies of wood) and adobe or sometimes rammed-earth construction (in arid regions with scarce wood-resources). Some areas use brick almost exclusively, and quarried stone has long provided walling. To some extent, aluminum and steel have displaced some traditional building materials. Increasingly popular alternative construction materials include insulating concrete forms (foam forms filled with concrete), structural insulated panels (foam panels faced with oriented strand board or fiber cement), and light-gauge steel framing and heavy-gauge steel framing.

Houses may be supported by a crawl space, full or partial basement or a floating slab on grade. Basements can be constructed of wood, poured concrete or masonry blocks. Poured concrete is becoming the norm for most housing and is far superior for cost and strength.

Most common wall framing is either balloon or platform type framing. In platform framing, the joists comprise any number of individual floors or platforms that wall framing components are constructed on top of–hence, the term platform framing. Platform framing is the most common method of frame construction. The floor, or platform, is made up of joists that sit on supporting walls, beams or girders and covered with a plywood or OSB sub-floor. In the past, 1x planks set at 45 to the joists were used for the sub-floor. Balloon framing is not permitted anymore due to lack of fire-stopping between floors.

Foundation made of concrete typically will have some cracks that are visible. Most cracks are the result of settling or shrinkage of the concrete during its curing stage. Diagonal cracks that grow in width, especially ones that are wider at the bottom than at the top, indicate settlement. Diagonal cracks over windows indicate a weak header. Diagonal cracks in a poured concrete foundation that are fairly uniform in width or are hairline-type are caused by shrinkage and, though they may allow water entry, do not constitute a structural defect. Some home inspectors think that if the crack follows the mortar joint, rather than going through the brick or block, the crack isn’t a problem. This is false. Walls crack at their weakest point. If the mortar is stronger than the brick, the wall will crack through the brick

The structural support of a roof is typically provided by either stick built rafters or engineered trusses. Collar tie is a colloquial phrase that you usually won’t find in construction or engineering documentation even though the words are commonly used among builders, architects and homeowners. The correct phrase as used in textbooks and when specified is collar beam. Collar beams are usually installed in the upper third of the roof between opposing rafters.

Having your home inspected prior to purchasing is one of the most important items of the transaction. You want to protect yourself from shoddy workmanship or major problems with your homes systems. A house is comprised of many different products installed by various tradesmen and sometimes do-it-yourself type renovators. To ensure Peace of Mind in your next Real Estate transaction use the Barrie Home Inspector for your protection and Peace of Mind. If you have a wood burning appliance then contact www.wett-inspection.com for your insurance companies required WETT Certification.

Moisture and Your Home’s Bricks

Exterior

Moisture and Your Home’s Bricks.   Moisture can do a great amount of damage to your home.  This is especially true when you live in a climate where freezing occurs.  Water turns to ice which expands when frozen and this can cause quite a lot of damage to your bricks and concrete products in your home.

Bricks for building may be made from clay, shale, soft slate, calcium silicate, concrete, or shaped from quarried stone. However, true bricks are ceramic, and therefore created by the action of heat and cooling.
Clay is the most common material, with modern clay bricks formed in one of three processes – soft mud, dry press, or extruded.

As a Professional Home Inspector I come across many brick homes where the brick weeping holes have been filled, commonly with spray foam, this is not permitted as the weeping holes are very important to the maintenance of brick.  This weep holes should be spaced 600 mm apart or 24 inches.  Plastic or metal preformed weep holes can be utilized to keep our insects etc.

Poor workmanship is one of the main causes of brick failure.  Poor mortar mixing, allowing mortar to dry out, poor storage of masonry units, and unbonded mortar on joints all lead to potential for mortar cracking and the intrusion of moisture which causes deterioration and spalling.  The proper application of mortar will affect how well the bricks will repel rain and other moisture issues.

Brick walls are never waterproof. Bricks and mortar are able to absorb a great deal of moisture in multiple ways and must be able to breathe to eliminate this moisture. Sealing weeping holes eliminates the drainage of the space behind bricks which also allows for air movement in cavity.  Solar heat will drive moisture on surface of bricks through into the cavity adding to moisture content.

There are two common types of window sills, brick and concrete sills.  Both of these sills are susceptible to moisture damage in winter climates.  Any small crack or failure for mortar to bond to bricks provides an entry point for moisture.  The freezing cycle will continue to expand these tiny cracks until brick damage occurs.

The Barrie Home Inspector routinely comes across this problem at the early stages of mortar cracking and routinely points out to his clients the benefits of maintenance in preventing more severe damage.  The old adage of “an ounce of prevention is better than a pound of cure” is especially true in the maintenance of your brick window sills.

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