Roof

[JdGriswold]

Originally Posted by Larry-NC

Ah. On the one I'm doing, the roof decking was nailed to the trusses. There is pink fiberglass insulation beneath. This difference may be because ours is a 22' unit with no air conditioning ducts; just dumps in the center.



The worst of the water intrusion was where the awning anchors span the gutters. That causes the gutters to clog and overflow. In turn the water follows the lag screws that hold the anchors on. A widely practiced bad design.

Time for new decking

[Larry-NC]

Originally Posted by JdGriswold

Time for new decking

Try to take each panel off in one piece so you can cut the replacement to the same size with the cutouts in the same place.

In my case, some of the decking was good and stays in place. I can but the replacements against it to assure good end to end placements.

I made small marks on the siding above/behind where the rain gutter goes at the center of each truss so I could snap a chalk line across each panel.

And of course, I started screwing each panel down in the center and worked my way to the sides to get gap-free contact with the arched truss surfaces.

[JdGriswold]

Originally Posted by Larry-NC

Try to take each panel off in one piece so you can cut the replacement to the same size with the cutouts in the same place.



In my case, some of the decking was good and stays in place. I can but the replacements against it to assure good end to end placements.



I made small marks on the siding above/behind where the rain gutter goes at the center of each truss so I could snap a chalk line across each panel.



And of course, I started screwing each panel down in the center and worked my way to the sides to get gap-free contact with the arched truss surfaces.

That would be a great idea if I had trusses it is all styrofoam kinds scary thought I was gonna go thru the roof while tearing of the decking

[MillMitch]

Is that even a walkable roof? How can there be no trusses? The A/C unit would come through the roof on the first bump.

[Rhumblefish]

It's a walkable roof; the wood+foam arch forms a composite structure and is more than self-supporting. However, because you're messing with a structural component, you're definitely going to need to re-adhere/glue the new ply to the existing foam. I'd suspect the glue you use is going to need to be pretty specific performance in this application (I understand the factory vaccuum bags the entire roof for assembly, so whatever process/materials you go back with will have to yield a structure that has that level of adhesion/performance or better.

[Larry-NC]

Originally Posted by Rhumblefish

It's a walkable roof; the wood+foam arch forms a composite structure and is more than self-supporting. However, because you're messing with a structural component, you're definitely going to need to re-adhere/glue the new ply to the existing foam. I'd suspect the glue you use is going to need to be pretty specific performance in this application (I understand the factory vacuum bags the entire roof for assembly, so whatever process/materials you go back with will have to yield a structure that has that level of adhesion/performance or better.

Or...put the new decking over the old decking.

[Larry-NC]

Originally Posted by MillMitch

Is that even a walkable roof? How can there be no trusses? The A/C unit would come through the roof on the first bump.

Not familiar with construction processes? Our congregation is in a building built in 1970. Much of it is flat roof.
Corrugated galvanized steel is placed over the beams.
6" of styrofoam over that.
Rubber membrane with lap sealant over that.
Gravel over that.
Yes, people walk on it, including the air-conditioner service people. I imagine there is framing beneath the air conditioners.

[JdGriswold]

Originally Posted by Larry-NC

Not familiar with construction processes? Our congregation is in a building built in 1970. Much of it is flat roof.

Corrugated galvanized steel is placed over the beams.

6" of styrofoam over that.

Rubber membrane with lap sealant over that.

Gravel over that.

Yes, people walk on it, including the air-conditioner service people. I imagine there is framing beneath the air conditioners.

[JdGriswold]

Originally Posted by JdGriswold

Attachment 283717

New decking is on

[JdGriswold]

Originally Posted by JdGriswold

Attachment 283718


New decking is on

Attachment 1

[5picker]

Originally Posted by JdGriswold

Attachment 283718

What's with the burned mark and sharp/rough edges at that spot? I wouldn't want the membrane wrapping over that if mine.