Porch Roof Column Spacing

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.

Porch roof column spacing.

The beams support the roof rafters or joists which in turn hold the roofing material. Grout shall be concrete or type m or s mortar 5. This tells you the size of the beam needed to support the porch s roof. 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.

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. All concrete shall be a minimum 2500 psi 4. 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. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

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. Max height of column shall be 10. This porch by dalrymple sallis architecture measures about 7 ft. We cannot make these determinations for you but generally for standard porch construction porch posts can be spaced up to ten feet apart.

Here s an easy way to determine both equal spacing and placement between two fixed points such as porch columns. However for the normal porch the columns are the posts in a. The following discussion does not take into account structural considerations. It is typically not the strength of the posts but the strength of the beam above that limits porch post spacing.

2 1 m from the face of the columns to the walls of the house and wraps around two sides. In the example d calculates to 7 75. 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. This means the example porch would need a 6 inch by 8 inch beam.

Make sure to check with your local building department which has codes that determine the minimum size and spacing for posts. You can also use this device for many different uses. Calculate the initial value for d then round it up to the nearest inch. 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.

A 4 by 10 can usually span up to 12 feet between posts.