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Brian calgary
Dryer vent installation through vinyl siding
Brian calgary

I live in Calgary, AB. The dryer exhaust vent on the house I just bought came off. It was just screwed into the vinyl siding. I want to fix it by installing a dryer vent mounting block combination underneath the siding. Something like this https://www.lowes.ca/ventilation-accessories/788-in-x-713-in-white-dryer-exhaust-mounting-block_g1572759.html

What is the proper way to install a dryer vent mounting block with vinyl siding? Do I need to install flashing above the mounting block and tape the flange? Or would a bead of caulking underneath the flange be sufficient?

dj1
Re: Dryer vent installation through vinyl siding
dj1

You can just use caulk to seal the mounting block to the siding, assuming that your house has the proper house wrap under the siding. Caution: if you need to cut the siding, think twice before you cut once.

Just make sure the it fits over one course of siding, you are trying to mount a flat block onto a sloped siding, so make sure that the block is smaller than one course of siding.

Mastercarpentry
Re: Dryer vent installation through vinyl siding
Mastercarpentry

The siding is cut away to accommodate the box. Leave ~1/4" (7,mm) space all round to allow for siding movement. I'd caulk under it. The trim snaps on top If you have room to move things a bit, place the box vertically where the top of the trim will slightly lap over the thickest part of the siding then caulk behind the trim. If you can't move it then caulk where the siding meets the box on top before applying the trim. Use clear silicone and don't be messy- use a thin bead just enough to do the job. If any squishes out visibly don't try to wipe it with a rag; instead work ti directly away from the house with a clean putty knife. With the top sealed almost all of the rain will stay out and what little doesn't will be handled by the underlayment (felt paper or housewrap) under the siding.

Phil

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