Jump to content

Clay Roof Underlayment


Mike Lamb
 Share

Recommended Posts

Looks like clay on top of an old 3 tab asphalt. There is an apparent roofing underlayment under the clay and on top of the old roof. I know the clay roof is only as good as the underlayment. What are your thoughts on this installation?

Click to View

200912213758_clai1.jpg

72.48 KB

Click to View

200912213828_clay.jpg

89.89 KB

Click to View

200912213934_clay4.jpg

93.77 KB

Link to comment
Share on other sites

Hi,

Well, the first thing I'd be wondering is whether every row of comp shingles is telegraphing up through the surface and resulting in a roof plane that isn't consistent. The old comp roof, with another layer of felt on top of it, though not ideal is probably the equivalent to the two layers of felt underlayment that's required, no?

ONE TEAM - ONE FIGHT!!!

Mike

Link to comment
Share on other sites

Couple things....

1) baseline, it's crap, but you already knew that.

2) as bad as this sounds, it might actually work OK depending on the flashing (as usual).

3) rusted out metal step flashing that's stuck to the brick w/mastic is a confidence shatterer.

By any industry standard, it's a joke. Because of what Mike said about shingles =ing 2 layers of underlayment, it could work, but I sure as heck would land on it with lead boots in any report my name was attached to.

The moss at the edges just says there's excess moisture right at that spot. I always see moss at the hips and eaves of tile roofs that haven't got metal channel or flashing. Not good, but if it's just at those spots, I'd have a hard time calling it bad.

Link to comment
Share on other sites

I rarely see or inspect anything other than asphalt comp. I believe this is my second clay roof, but after doing some research and driving back today for another look, I think Mike O. got it right and it’s probably OK. I was told that all of this is original 1962 which I didn’t believe at first but do now.

The NRCA says you shouldn’t install clay over anything less than a 4:12. This was about a 3. So this is a cosmetic cover. Regardless, I think they installed a typical 3 tab asphalt and threw an underlayment over that and a clay roof on top of that. There were a lot of broken tiles (my guess is from painters) and the eave may need maint. but I think it’s overall a good system. The flashing needs some maint. but looked good. There was no signs of tar “repairs,â€

Link to comment
Share on other sites

Originally posted by kurt

No saddle behind that last (looks >36" wide) chimney......did you say this one leaked?

Biggest question......how big are the rafters? Lotta weight added to a roof structure.

No cricket and, yes, that is the one that was leaking. I'm leaning towards poor caulking at the counter flashing or very bad mortar joints near the chimney crown, or both.

Rafters were fine and dandy. I do believe this roof is original.

Link to comment
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.

 Share

×
×
  • Create New...