Foundations 3/26/2010. What is a Foundation? The part of a building that rests on and extends into the ground. It provides support for he structural loads.

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Presentation transcript:

Foundations 3/26/2010

What is a Foundation? The part of a building that rests on and extends into the ground. It provides support for he structural loads above.

Lets Recap In the building of our house We have set aside $$ and or received a loan Researched and purchased land. We have met with an architect and/or contractor to design our dream house We have looked over and reviewed all local ordinances and filed for proper building permits The land has been surveyed and a perk test has been preformed. The contractor has excavated the site and leveled the base. The foundation walls where staked out The contractor has now dug out a hole where the foundation will rest. Now this brings us to foundations…….

Hold on a Minute WHAT TYPE OF SOIL DO WE HAVE AND HOW DOES THIS EFFECT OUR FOUNDATION?

How much weight can the ground take before there is failure. Remember: Your foundation is only as good as the ground it rests on. Clay: 2000lbSqFt Sand: 3000lb/SqFt Sandy Gravel: 5000lbsSqFt Sedimentary Rock: 6000lbsSqFt Bedrock:12000lbsSqFt Best left to a structural engineer if questionable. Same type of person that would be checking concrete composition and compression testing.

Options for foundations Full basement- –Pros: adds additional space for storage and possible living area, shelter in event of natural/unnatural disaster (bomb shelter?), naturally cool storage place for food. –Cons: Not included in houses SQFT unless finished, can lead to flooding problems if not properly cared for, costs more, leaves a bigger carbon footprint due to amount of concrete needed. RADON

RADON GAS Radon gas is a naturally occurring Radioactive gas that comes up from the ground. It is dangerous in basements and crawl spaces because over time it can lead to cancer. In the natural environment it is immediately dissipated into the air where when it come up though a foundation into a house it is trapped. You cannot smell, Taste, or see Radon gas There is no ways to prevent Radon, However there are ways to expel it from your foundation through exhaust fans and other forms of abatement. What does this mean for the home owner…..$$$$$ Is it common? YES especially in lower Michigan. The best thing to do when building or purchasing a house get it checked so you can make informed decisions. The cost for having it checked is very small compared to potential consequences down the road.

Options for foundations cont. STD. Foundation, A.K.A. Crawl space. –Pros: Cheaper than full basement, less environmental impact due to less concrete, Still as structurally sound and supportive as a full Basement. –Cons: No additional space gained, Still can have water issues, RADON, harder to inspect and maintain I sense of working conditions.

Post Foundation Not common in any modern home. Very common in pole barns, and some northern cottages. Will not meet code in MI for livable structure, however there is a loophole If you use it solely as a vacation home you may live in it. So no full time residency is allowed. Check local ordinance just to be sure.

Types of Foundations Concrete foundation-Most common- Masonry: A.K.A. Brick or block Wood- This type of foundation may or may not meet local code in parts of the country.

Parts and terms of a foundation. All foundations consist of the following 2 major parts

Foundations Parts Cont. Parts for you to know –Sill Plate –Anchor Clips Different forms and types all accomplish the same task

Rules for all foundations In order to carry structural loads all Footers should be twice the thickness of the foundation wall wide. So therefore the footing would project ½ the thickness of the wall on the left and right side of the foundation wall The footing height should be at minimum the same as the thickness of the foundation wall.

Lets take a closer look Here is a cutaway of a standard foundation with crawlspace.

Foundation with Full Basement

Typical wood Foundation

Lets take a closer look at a wood foundation in a home They have been around for years. They are proven to work, however for how long? Must be made of rot/insect resistant material All fasteners must be corrosion resistant. All framing lumber must not have a moisture content above 19% and the plywood must not be above 18% Modern wood foundations are a result of collaboration of the National Forrest Products Assoc, Wood Preservers institute, and the US dept of housing and urban development. And regional code agencies.

Wood Foundations Continued Basically a wood foundation is constructed the same as a stud wall. AKA walls in your house. Only difference for the most part is the material used Can be built off site in sections and quickly assembled at the job site. Eco friendly, because it is a renewable resource and leaves a smaller carbon foot print than concrete or masonry foundations.

Wood Foundations pictures.

Key Terms Please write down and Define the following Key terms from this week Foundation Sill Plate Footer Radon Crane Backhoe Cement Pumper Scissor Lift Material Lift Post Hole digger/Auger Surveyor Local Ordinance Sub Soil Drainage Excavator Bulldozer Concrete Portland Cement Gravel Train