Footing For Deck With Roof
With these style of deck footings there is a lot more work to do.
Footing for deck with roof. Deck footings come in a variety of sizes for various sizes of posts ranging from 10 pads to 24 pads. Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons. However if your deck will include a hot tub or roof you must support that weight with additional footings. Put a roof over that deck and perhaps a pier footing foundation is a better choice because it offers more uplift resistance.
For example if you are building a 10x10 deck attached to a house with two footings on the corners you could calculate the loads for the footings in the following way. Up from the bottom of the footing. This is a common rule for footing so don t forget that. Then dump concrete through the tube into the bottom of the hole.
For a 10 8 deck with 12 footings expect to spend about 160 on footings. The roof loads add to the size of the required bearing area and the projection of the footing under the fill provides for uplift resistance. Check out our deck footing frost map to help you understand how deep your footings will need to be excavated. You still have to dig footing holes.
If the deck doubles as a porch it needs to be able to support no more than 80 psf. The flat part at the bottom must be at least 6 thick. First draw a line dividing the deck into two halves between the house and the footings. Homeadvisor s deck framing guide instructs on how to plan and build a frame including spacing and adding footing posts brackets and anchors beams rim joists and other support features for a deck s foundation.
As long as you are considering all the science behind foundation design the. Or if your deck has many angles additional footings are necessary. You will notice that the support post is also embedded deeply into the concrete and extends no closer than say 4 from the bottom of the footing. This raised deck is intended to be attached to a house and sturdy enough to accommodate future additions such as a roof.
Larger pads are more expensive. Porch decks also require larger footings than deck footings. Do this by nailing the sides of the tube to the center of a tic tac toe grid of 2x4s at the top of the hole. Pads run 80 for six 10 pads.
Decks typically are designed to support 55 pounds per square feet or psf of weight. We will teach you how to determine the code compliant size of your footings based on the soil type and tributary loads. How to get a solid frost proof footing. Use batter boards and mason s string lines to lay out locations for seven support footings of 12 inches in diameter.
To decrease the number of footings but likely increase the cost of construction you can instead use an engineered beam.