Roof Support Member

Roof truss parts explained.

Roof support member.

The other is just used to support the trusses. The same roof has a 4 12 or 1 3 pitch. Porch decks also require larger footings than deck footings. Strutting beams support the roof members where there are no load bearing wall studs available.

Strutting beams should only support roof loads and not be used as ceiling joists. A great deal depends on the pitch of the roof. If the roof is attached to the deck it needs to be able to support the weight. One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads.

The principal rafters are linked by a collar beam supported by a pair of arch braces which stiffen the structure and help to transmit the weight of the roof down through the principal rafters to the supporting wall. Decks typically are designed to support 55 pounds per square feet or psf of weight. Slope a roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run. Lacking a tie beam the arch braced arched brace truss gives a more open look to the interior of the roof.

Domestic roof construction is the framing and roof covering which is. Heavier under purlins or purlin plates. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. A top plate is nailed to the top of wall studs.

Where necessary struts shall be provided to support roof members such as underpurlins ridgeboards and hip and valley rafters. This is where a high pitched roof is necessary. Plywood or oriented strand board form the roof deck also called the sheeting or sheathing to support the roof covering. Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists.

The united states still uses imperial units of measurement and framing members are typically spaced. If the deck doubles as a porch it needs to be able to support no more than 80 psf. One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads. A waterproofing layer that protects the roof valleys from leaking.

A higher pitched roof would be better for extra living space than a lower pitched roof. A measurement of roof area that equals 100 square feet an area 10 feet by 10 feet. Some of these can support the roof and prevent ridge sagging and wall spreading. Horizontal beams supported by posts and used to support the mid span of rafters to cover longer spans these are used in large buildings like the traditional large old barns in the us.