Making blueprints for house foundations

The foundation blueprints will be required by the building inspector so that he or she can see how the foundation and footings will be constructed. Blueprints will need to indicate the compliance to building codes by the proper use of cement and rebar. Also, the depth of the footings and foundation will need to be listed on the blueprints.

The frost level is really important here. Your local inspector can tell you how deep you need to dig the footings to get below the frost line. Frost causes the soil under foundations to expand and contract with the temperature. That's not a good thing so we need to get below it where the soil doesn't ever freeze.

house foundation


Before we can roll up our sleeves and pour the foundation, we need to plan it out with a foundation blueprint.

blueprint foundation

Here is an actual engineers copy of a foundation blueprint. Sorry it's so fuzzy. As you can kind of see, it has an overhead view of the cement foundation layout. It also has detailed specifics on the footings, depth, reinforcement and sizes of the footer and foundation wall.

crawlspace blueprint


If the house will have a crawlspace it will need to be included in the foundation blueprint or its own separate blueprint. The same goes for a basement.

footing blueprint


The blueprint needs to detail out where and how much rebar is being used in the foundation. Rebar makes the concrete more stable, but it also allows the foundation to be slightly flexible in cases of movement like earthquakes. inspector will have have the requirements and detailed diagrams for local concrete and rebar codes.
You will also need an overall top view of how the foundation will look once it is poured.

foundation blueprint



home foundation


Building inspectors just want to know that the foundation will be strong enough to hold the house in place without having problems from beneath the footer like frost.

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