Attic Fan Joist In Joist Out

The span of the joist is approximately 7 8 feet.

Attic fan joist in joist out.

I am planning to finish a space in my attic. If your attic joists won t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage you can install inch plywood or. The planned room will sit over a load bearing wall however part of the existing. Joist in vs joist out whole house fan installation.

Mark the joist from the attic use the test hole you. Lift the fan through the opening into the attic. After examining the joists in my attic i don t think i will be able to properly carry a new joist into the attic push it toward the soffits and nail screw it in properly. The existing joists are 2x6 and running about 13 from support to support on either side of center.

This method leaves the ceiling joists intact. I m a 1 man crew for the most part. Do not cut any joists. Because of this i am planning to attach sister 2x8s to each joist.

Unless you re using mineral wool insulation or your fixtures are rated safe for contact with any type of insulation don t allow the material to touch or cover recessed cans or. Joists illustration b the 2 x 4s must be at least as long as the fan 24 or 30 inches and must be spaced at least 36 inches apart so that the fan fits between them. Adding a support between the joists enables you to put the fan where you want it in the ceiling. Before cutting a joist in a finished ceiling we suggest cutting and removing the sheet rock from the shutter opening figure 7 and then framing the opening between joists and at the side with joist sized lumber extending to and nailed to the adjacent joists as shown in figure 8.

The fans fit in a rough opening 14 5 inches x 22 5 inches so the unit can be installed in between attic floor joists either 16 or 24 inches on center. Unless properly framed a cut joist can weaken the structural support of the house. Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. Box out light fixtures.

Posted by ryan mcconnell on 03 may 2012 01 35 pm. Sorry for not responding sooner. Please note that this requires another attic access since the fan will not fit through the shutter opening with the joist in place. These are trimmer joists.

The 1 000 cfm of air flow requires only 1 33 ft2 of net free vent area.