I want to install three 18" x 24" gable end vents into my attic and also re-install a power vent that had been removed when the roofing contractor re-roofed our home.
My question and concern:
At the vertical centerline, and on the inside of each of the three gable ends there is a 2 x 4 (4" against the exterior siding) support that is part of the gable end truss system that will be right in the middle of the vent.
If I move the vents to either side of the stud, it won't be centered and will look ackward from the outside. If I install the vent directly over the stud, it may substantially reduce the efficiency of the vent. Any way to overcome blocking the new vent without cutting the truss? I'd appreciate some guidance before I get into this project too far.
Thanks.
Brushman

 

Hi Brushman, in my opinion I don't think the 2*4 behind your 18" * 24" vent is going to restrict your vent that much.

As far as cutting it, first, how big of a gable is it, is it structural or non. Is it sheated solid or?

If you want to remove it, there are easy ways to do this. If it is a true non structural gable end - no diagonal compression webs - you could, cut it out a section where the vent is going, and put two more in, 1 foot to either side of the original with horozontal blocks between, catching the ends of the now cut centre member. You could cut out for your vent, and spike a 4' to 6' 2*4 over the cut member, in effect still blocking your vent but in 1 .5", still allowing air flow.

Some gables are structural, compression webs the same as your common trusses with vertical 2*4 between them and top and bottom chords, backing for your exterior sheathing/siding. If this is the case no worries in cutting it out.