Construction Adhesives

[mreynolds]

Other than installing sheeting over the floor of your house and installing windows and doors, are there any other areas that you should use construction adhesive/sealer when building? :roll:

[Rich]

The only thing that really comes to mind is if using a poly liner in the crawlspace.. where you would adhere the poly to the footings. One possible use of a sealer would be on concrete slabs - garage / basement..etc. Possibly some adhesive used on roof flashing and penetrations in the roof.

[grumpydasmurf]

I wouldnt really call the sealer used on roofing an adhesive. It's really a very poor excuse for a glue but the use of some type of caulk is required in many areas of your roof like... exposed nail heads and flashing joints

[Rich]

Good points. I was more thinking of one project I had where the architect (and waterproofing consultant concurred :twisted: ) to not penetrate the roof flashing with any nails. Where I would typically lay the flashing one foot up on each side of the valley and nail at the top of the flashing - they suggested we glue the flashing down with PL-400. The owner also wanted it that way.. we ended up signing an agreement saying that it was not our preferred method and would not be responsible if it blew off the roof etc.. Same went for the singles within the range of the flashing.

[grumpydasmurf]

Why no nails in the valley flashing? To be honest we use some nails to tack down our flashing until we can install the shingles but the nails that really hold it in place are the nails from the shingles ontop of it. These nails are fastened into the nailing strips of the shingles which means they become sealed and won't leak once sealed.

We also install I&W shield in all our valleys.

[Rich]

I totally agree. That's what happens when you get an unknowledgeable architect and an owner that thinks the architect is the best thing since sliced bread.

[grumpydasmurf]

It's funny because architects don't know everything.. but they act like they do. Some of the plans I have seen I could redesign better.

I saw a multiple level flat roof and was trying to think what the architect was smoking when he designed the slope for drainage. I was also confused why he was using the material he wanted to use. Oh well... and if anything goes wrong it's the sub's fault because the architect puts a big long disclaimer in all his plans.