| Author | Message | ||
     Bob_wewer (Bob_wewer) New member Username: Bob_wewer Post Number: 5 Registered: 11-2013 |
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. | ||
| Kwhord (Kwhord) Senior Member Username: Kwhord Post Number: 221 Registered: 10-2006 |
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. | ||
| Old_school (Old_school) Senior Member Username: Old_school Post Number: 140 Registered: 01-2009 |
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. | ||
| Ellenmpratt (Ellenmpratt) New member Username: Ellenmpratt Post Number: 1 Registered: 05-2009 |
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. | ||
| Tim Dittmar New member Username: Tim_dittmar Post Number: 3 Registered: 05-2008 |
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. | ||
| Slate Affair Inc. Senior Member Username: Slate_man Post Number: 190 Registered: 01-2007 |
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.    |
