Jump to content

Questions on a low pitch roof


Recommended Posts

I haven't had the chance to do many low pitch roofs. First of all I think this roof is EPDM. Secondly, what are these square marks showing through. Some are rigid in the middle like a bolt head. Could not see underside of roof.

Image Insert:

2008102322395_fqp1.jpg

68.28 KB

Image Insert:

20081023224651_fqp4.jpg

52.49 KB

This picture is the roofing material stretched over something. It is very spongy in the corner.

Image Insert:

2008102322414_fqp2.jpg

62.23 KB

This patch, by the stack is a different material, maybe PVC? It has bumps on it. How is this sealed on the ends, torched down?

Image Insert:

20081023224243_fqp3.jpg

60.07 KB

Frank

Link to post
Share on other sites

Probably EPDM, and those squares are the fasteners that the membrane is adhered to.

EPDM goes down with solvents, not heat. The grey goobs of caulk around those repairs look wrong. Different material as a patch is definitely wrong.

Link to post
Share on other sites

It is Epdm and its seamed with tapes or adhesives. Those are the plates and screws that secure the insulation to the deck and possibly the epdm is also adheared to them. It appears that there is a epdm square at each plate. The material used for the flashings is form flashing or uncured epdm. Sometimes it does have a textured surface and it looks like the right stuff. The caulk looks like the wrong stuff but it wont make or break a good roof.

Link to post
Share on other sites

I was told by a Carlisle guy that certain caulks, i.e., Vulkem or equal, would damage the EPDM. I thought you shouldn't use caulk, had to be solvent/adhesive.

I've never seen uncured EPDM; it's always been the same smooth material for flashing.

Link to post
Share on other sites

No, polyurethanes, silicone ect wont hurt epdm. Any type of roof cement or oil based product would though.

The caulk is used after the adhesive for a temporary seal until the glue cures and for T bar, Boot tops ect.

Regular (cured) epdm will not form through angle changes or around pipes and such things. Thats what the uncured form flashing is for. Its also used for T joints, vertical patches, curb corners ect. The material on the stack and gas line in the pics is form flashing as is the strip in on the boot.

They used to use neoprene but it ages and splits.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...