Porch Roof Column Spacing

Careful consideration needs to be given to the location size and number of posts and columns your porch needs.

Porch roof column spacing.

In the example d calculates to 7 75. We cannot make these determinations for you but generally for standard porch construction porch posts can be spaced up to ten feet apart. 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. 2 1 m from the face of the columns to the walls of the house and wraps around two sides.

All concrete shall be a minimum 2500 psi 4. A 4 by 10 can usually span up to 12 feet between posts. The main structural members of patio and deck overheads are posts or columns and beams which run from post to post or from post to ledger. The beams support the roof rafters or joists which in turn hold the roofing material.

Make sure to check with your local building department which has codes that determine the minimum size and spacing for posts. It is typically not the strength of the posts but the strength of the beam above that limits porch post spacing. Max height of column shall be 10. This tells you the size of the beam needed to support the porch s roof.

Calculate the initial value for d then round it up to the nearest inch. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. The following discussion does not take into account structural considerations. Here s an easy way to determine both equal spacing and placement between two fixed points such as porch columns.

Bottom of footing shall be a minimum of 12 below undisturbed soil 3. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. You can also use this device for many different uses.

This porch by dalrymple sallis architecture measures about 7 ft. This means the example porch would need a 6 inch by 8 inch beam. Spacing between columns as well as the detail of the column support and the area where the column transitions into the roof known as the entablature need careful and knowledgeable consideration. Purchase an elastic band approximately 1 2 to 1 inch wide by 6 to 8 feet long lay it on a flat surface and mark it in 2 inch increments.

A porch roof could also be trussed or i have seen space frames that don t need columns either because they are attached to the building.