Weather and underlayment Log Out | Topics | Search
Moderators | Register | Edit Profile

Slate Roof Central Message Board » Ice and Water Membrane, Plywood, and other Controversies » Weather and underlayment « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Bob_wewer (Bob_wewer)
New member
Username: Bob_wewer

Post Number: 5
Registered: 11-2013
Posted on Thursday, November 07, 2013 - 11:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

15 lb. is more permeable under the slate as any trapped moisture tries to escape. Anyway the metal snow belt is the right way to go along with attic insulation, air sealing and vapor barrier paint on ceilings along with intake and exhaust (balanced) ventilation. Just forget the bandaides and diapers.
Top of pagePrevious messageNext messageBottom of page Link to this message

Kwhord (Kwhord)
Senior Member
Username: Kwhord

Post Number: 221
Registered: 10-2006
Posted on Wednesday, May 13, 2009 - 10:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Absolutely use some rosin or 15# felt between the grace and the slates. The better option would be to use snow flashing or high-back gutters if you have built-in gutters.
Top of pagePrevious messageNext messageBottom of page Link to this message

Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 140
Registered: 01-2009
Posted on Tuesday, May 12, 2009 - 10:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Ellen, he is right. If you use Grace beneath your slates, install some felt of other paper over it and beneath the slates. It saves a lot of cursing if you have to repair any broken ones.

That is the voice of experience talking. Good judgement comes from experience. Experience comes from bad judgement.
Top of pagePrevious messageNext messageBottom of page Link to this message

Ellenmpratt (Ellenmpratt)
New member
Username: Ellenmpratt

Post Number: 1
Registered: 05-2009
Posted on Tuesday, May 12, 2009 - 09:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I live in Vermont and have a slate roof. The house was built in the
30s. We're having a roofer install a snow/ice belt along the edge of
the roof where we've had leaking. He says he'll put "paper" under the
slate, not the Grace Ice Shield. Do you know whether the Grace ice
shield is better than paper. He says the slates stick to the Grace
shield and, if/when you have to replace the slates, they'll break
because they stick to the Grace shield.
Top of pagePrevious messageNext messageBottom of page Link to this message

Tim Dittmar
New member
Username: Tim_dittmar

Post Number: 3
Registered: 05-2008
Posted on Friday, May 16, 2008 - 11:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I think the use of heavier asphalt felts(more than 15 lb) can create laying problems for slaters- particularly at the laps and around valleys where layers could be 3-4 plies thick- this of course providing for a strict minimalist technique. It can get worse when the heavy felts shrink in sunlight, etc. while waiting to be slated. Slates can be hard to "bed down" with a wad of tarpaper under part of the shingle- then you might have a "rogue" nail as a result, for one. I've observed a whitish-silvery powder from deteriorated slates caught along the tops of slates and associated with 30lb or heavier felt- it seems alot like what happens to stacked slates that get wet and stay wet and maybe also freeze- they turn back into "mud". Slates may get wet from sweating inside the shingling- does the heavy felt retard their drying ? Haven't seen this powder with the olde resin papered roofs. Slating over unremoved asphalt shingles is really dumb. Some of the worst of this syndrome makes real problems for repairwork with the use of a ripper.
Top of pagePrevious messageNext messageBottom of page Link to this message

Slate Affair Inc.
Senior Member
Username: Slate_man

Post Number: 190
Registered: 01-2007
Posted on Thursday, March 20, 2008 - 06:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

What is underlayment for, a life of protection that will last longer then your 100 to 150 slate roof? What is the warrenty for most underlayments 6 months exsposed to the weather, will it last all that much longer under the slate roof, No most likely. Here is some pictures of high performance underlayment that has been exsposed for less then 6 months. Between its falling apart and shovels ripping it. You can see that a underlayment is a temporary way of protecting your roof as you install it.
underlayment
u
underlayment

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Last Week | Tree View | Search | User List | Help/Instructions | Program Credits Administration