Post And Purlin Log Roof

Helping a student with his post frame thesis.

Post and purlin log roof. A common arrangement is a rafter and purlin system which combines purlins and rafters. Our machinery can produce logs up to 32 in diameter. Purlin spacing 23 75 in. These span across the empty space and a.

For accuracy and tight fit these trusses cannot be matched. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc. Dead load will be the actual weight of the roof steel and the roof purlins. The use of purlins as opposed to closely spaced rafters is common in pre engineered metal building systems and both the ancient post and beam and newer pole building timber frame construction methodologies.

4 12 roof slope 18 435 roof angle trusses spaced 15 ft. 100 of the bearing surface is in contact at the member connection. The roof support system is a ridgepole and either rafters which run perpendicular from the top of the walls to the ridge or purlins which run parallel to the ridge. The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof.

5 htm high thermal mass passive solar house plan roof details complete with log purlin notes and low tech vented cold roof sips panel design considerations for the do it yourselfer passive solar roof details do not have to be unique but cold vented roof design with vented sips panels and layered insulation is a natural with log purlins. Diy post frame construction and winch boxes. Engineered purlin metal mart offers a complete line of engineered purlin material. Timber frame truss and purlins.

We can supply logs or timbers for trusses purlins posts and floor joists. Now all the a frames are in its time for the purlins. Adding purlins between heavy timber trusses is an elegant way to reduce the cost of a timber frame roof because purlins permit an increased on center distance between trusses so you purchase fewer trusses. An added benefit are the strong lines that purlins create by running parallel to the ridge beam s.

For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope. Roof systems precision joinery sets our log and timber roof systems apart from the rest. We have peeled cedar and pine logs log posts log trusses decorative or structural log post covers log beam covers log stairways knotty pine timbers log rafters and support beams for sale there s many ways to accessorize your home with our peeled log posts.