Attic Fan Joist In Joist Out

Adding a support between the joists enables you to put the fan where you want it in the ceiling.

Attic fan joist in joist out.

Standard ceiling joists sit on 24 inch centers and the space between them is 22 1 2 inches. I m a 1 man crew for the most part. 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. Joist in vs joist out whole house fan installation.

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

Mark the joist from the attic use the test hole you. The planned room will sit over a load bearing wall however part of the existing. Box out light fixtures. The span of the joist is approximately 7 8 feet.

Lift the fan through the opening into the attic. Please note that this requires another attic access since the fan will not fit through the shutter opening with the joist in place. Sorry for not responding sooner. Because of this i am planning to attach sister 2x8s to each joist.

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. 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. Do not cut any joists.

Putting a support in when you have access to the attic above the ceiling is different than putting. 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. 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. Measure the distance between the full joists on either side of the cut joists.

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.