How Many Posts For 17 Foot Roof Covered Porch

The span on your porch posts is determined by the weight load of the roof.

How many posts for 17 foot roof covered porch.

For a porch roof the beam needs to be sized according to the maximum snow loads in your area and you must know enough about the porch design to determine how the load will be distributed and over what distance the beam will carry the load. Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch. Here we look at the most common. Our main support posts are 8 on center with a 2 x 10 on the inside and outside of the post at the top and a double 2 x6 top plate.

If the beam that rests on the columns is built right or the beam and solid sheating from the beam to the overhang is reinforced it should be fine. Minimum roof pitch for a covered porch. Patio roof posts columns. Residential roofing with different pitches does not appear cohesive.

Step 1 determine the load per square foot that the roof must support. The smallest beams for patio covers are typically 4 by 6. Sometimes they e built up from more than one size of lumber. My porch extends about six feet in the center and eight feet on each end and is about eighteen feet wide.

The pitch of the covered porch roof should match that of the main roof. Post framing for a covered porch i follow rule of thumb keeping maximum height of 4x4 posts up to 8 high measured from the top of footing to bottom of girder. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. It was 16 wide x 40 long.

Do not go for a steeper pitch because the form of the covered porch will overpower or contrast with the main roof. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. And anything from 8 to 12 i would use 6x6 posts anything above that i will consult with my architect. Posts and columns may be made from several types of materials.

Any post that will touch the ground should be pressure treated for decay resistance. My aluminum column posts are about 17 feet on centers with no issues. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. A 4 by 10 can usually span up to 12 feet between posts.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. We just completed a beer garden addition with a single sloped roof. The roof load is composed of a. If it is not possible to match the existing roof choose a pitch that is shallower.

Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. Large 8 x 8 posts are necessary for the use of supporting a porch roof. Adding a covered porch adds exterior space to a house and providing a.