LVL RIDGE BEAM SPAN TABLES INSTALL

There are a couple of ways to hang the rafters from the ridge beam: from the top and from the bottom, using two different types of rafter hangers.

LVL RIDGE BEAM SPAN TABLES INSTALL

It's also a good idea to install several matching pairs spaced out along the ridge beam span in order to keep it straight, then go back and fill in the remaining rafters. Try to balance the installation by matching rafters on both sides as you work along, rather than installing all of the rafters on one side first. This can be tricky since each rafter will push on the ridge beam with its own weight, and this can push the beam out of line. Once you have the structural ridge beam set up, it's time to install rafters. A structural ridge can be used when installing structural insulated panels, or SIPs on a cabin roof. This is required for roof slopes less than 3 on 12 by the International Residential Code (IRC) and International Building Code (IBC) and also on a cathedral ceiling such as often used in log cabins.

The roof loads are carried by the LVL (laminated veneer lumber) and transferred down the load path via end supports and posts.ĭon’t be confused by the two similar terms:Ĭonventional construction of a gable roof or A-frame roof uses a ridge board and this is primarily for ease of construction it gives you something to nail the ends of the rafters to while assembling your roof.Ī structural ridge beam, instead, is used when the high ends of the rafters require independent support. It is also easier to assemble by installing the ridge beam and then hanging the rafters from the beam and can span long distances.

Using a structural ridge beam for your log cabin roofing is much stronger and more stable than a conventional ridge board held in place with rafters.

Lvl ridge beam span tables