How Many Posts For 17 Foot Roof Covered Porch

Any post that will touch the ground should be pressure treated for decay resistance.

How many posts for 17 foot roof covered porch.

Large 8 x 8 posts are necessary for the use of supporting a porch roof. Here we look at the most common. The pitch of the covered porch roof should match that of the main roof. 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.

The span on your porch posts is determined by the weight load of the roof. A 4 by 10 can usually span up to 12 feet between posts. 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. It was 16 wide x 40 long.

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. Adding a covered porch adds exterior space to a house and providing a. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. 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. Minimum roof pitch for a covered porch. The smallest beams for patio covers are typically 4 by 6. Do not go for a steeper pitch because the form of the covered porch will overpower or contrast with the main roof.

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. My porch extends about six feet in the center and eight feet on each end and is about eighteen feet wide. Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. We just completed a beer garden addition with a single sloped roof.

If it is not possible to match the existing roof choose a pitch that is shallower. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Posts and columns may be made from several types of materials.

The roof load is composed of a. My aluminum column posts are about 17 feet on centers with no issues. Patio roof posts columns. Cut beams to fit.

Sometimes they e built up from more than one size of lumber. Step 1 determine the load per square foot that the roof must support. Residential roofing with different pitches does not appear cohesive.