Roof Construction With Metal Rafters

Rafters are sloped beams that run from the roof s ridge to the eaves.

Roof construction with metal rafters.

Shed gable hip gambrel and mansard. For most load bearing requirements a roof truss will need to be placed every two feet along the walls. A purlin is a horizontal piece of timber or metal which supports the roof s rafters or decking and helps to prevent your roof from sagging. 12 50 a foot 12 40 14 95 a foot 42 60 all lean to shed trusses 1 12 pitch.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. When placing rafters for a tin roof also frequently referred to as corrugated metal or steel it is common to set the distance between rafters based on the size of the roofing panels. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Roofs are framed in five basic designs.

Rafter spacing depends on the roofing panel size. All american made engineered agricultural gable trusses 4 12 pitch heavy duty 2 angled steel painted black. Determine how many rafters you ll need for the roof. 2020 by stroud s building supply steel trusses.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Simple roofs such as a shed or the common gable are fairly easy to construct even without plans if you understand the basics and a little geometry. Discover the pros and cons to multiple roof designs. A hip rafter extends from the wall plate to the ridge in the angle of a hip roof.

Depending on how wide the home is you can divide the total length in feet by two to determine how many trusses will be needed. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Piece by piece rafter roof construction however is still the more common construction method for many buildings.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Most metal shingles will be attached to the roof using metal shingle. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall.

This allows the panels to be securely attached to the rafters for maximum stability.