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Old 04-29-2011, 09:53 AM   #1
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skylight self stick flashing advice


Hi Everyone,
Iím located in Southern California and am running into difficulty with the instructions for my curb mounted Velux skylight. The roof is a 3:12 using 1x6 strips with #15 felt and Ďpresidentialí asphalt shingles. Iíve done simple vent type flashing in the past but nothing like a skylight.

I purchased the flashing kit in addition to the skylight thinking that should be a complete solution. But as I read the flashing instructions I find out that an ĎAdhesive Skylight Underlayment is required. Which as everyone here knows is essentially a self-stick sealing tape. Of course Velux names their product (Z0Z-216) but thatís not available locally. So I go to the local big box and find what looks to be a similar item in either FortiFlash or Graceís Vycor asphalt flashing. However, when looking into it I find that those items are specifically for windows, sills, etc. and not for roofing. After some more researching I find that Grace has a Ďroof detail membraneí product that looks to be just for this application. Others on YouTube also recommended Graceís Ice and Water shield.

OK so this is the problem. Iíve called around and these products are not stocked. What should I use? Iím thinking that being here in Southern California near the coast it really doesnít rain very much and there is no show or Ice, so wouldnít Ice and Water shield be overkill? Would the Vycor flashing in this environment be sufficient? Perhaps thatís why the alternatives are not being stocked? And anyway, If I install the kit flashing right (a big if ), what does the adhesive flashing actually do? After all itís not a plywood base, itís just 1x6 strips, so there isnít a uniform surface to stick to. On the other hand, Iím concerned that the skylight warranty will be void if I donít follow their installation instructions. So I should use something, if nothing else but the peace of mind that it would be an extra precaution. Any suggestion on what to do here?

Thanks in advance,
Earl

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Old 04-29-2011, 04:53 PM   #2
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skylight self stick flashing advice


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Originally Posted by Earl0101 View Post
Hi Everyone,
Iím located in Southern California and am running into difficulty with the instructions for my curb mounted Velux skylight. The roof is a 3:12 using 1x6 strips with #15 felt and Ďpresidentialí asphalt shingles. Iíve done simple vent type flashing in the past but nothing like a skylight.

I purchased the flashing kit in addition to the skylight thinking that should be a complete solution. But as I read the flashing instructions I find out that an ĎAdhesive Skylight Underlayment is required. Which as everyone here knows is essentially a self-stick sealing tape. Of course Velux names their product (Z0Z-216) but thatís not available locally. So I go to the local big box and find what looks to be a similar item in either FortiFlash or Graceís Vycor asphalt flashing. However, when looking into it I find that those items are specifically for windows, sills, etc. and not for roofing. After some more researching I find that Grace has a Ďroof detail membraneí product that looks to be just for this application. Others on YouTube also recommended Graceís Ice and Water shield.

OK so this is the problem. Iíve called around and these products are not stocked. What should I use? Iím thinking that being here in Southern California near the coast it really doesnít rain very much and there is no show or Ice, so wouldnít Ice and Water shield be overkill? Would the Vycor flashing in this environment be sufficient? Perhaps thatís why the alternatives are not being stocked? And anyway, If I install the kit flashing right (a big if ), what does the adhesive flashing actually do? After all itís not a plywood base, itís just 1x6 strips, so there isnít a uniform surface to stick to. On the other hand, Iím concerned that the skylight warranty will be void if I donít follow their installation instructions. So I should use something, if nothing else but the peace of mind that it would be an extra precaution. Any suggestion on what to do here?

Thanks in advance,
Earl
The "adhesive skylight underlayment" is supposed to be included in the flashing kit. You must have gotten a flashing kit produced prior to the inclusion of sticky stuff. Up until about 2 years ago, one had to provide their own membrane.

Here's a link if you'd like to order the proper Grace product online:
http://www.grantlogancopper.com/inde...product_id=988


You should have some type of underlayment (felt) under your shingles. That's what the membrane sticks to - not the sheathing. And while you don't have much ice and snow, it's still likely there will be condensation on the back of the metal flashing due to the heat loss/gain at the skylight. The membrane is primarily to force any condensation back to the exterior, rather than letting it infiltrate around the skylight opening.

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Old 04-30-2011, 09:55 AM   #3
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skylight self stick flashing advice


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is supposed to be included in the flashing kit. You must have gotten a flashing kit produced prior to the inclusion of sticky stuff..
Thanks seeyou. That's odd, I just got the skylight last month. Do you know when Velux started adding the self stick underlayment?

After some more calling around, it looks like I now have three options . I can mail order the Grace roof detail membrane (9"x50') for $45, locally get Grace's Ice and water shield (12"x75') for $60, or get MFM's peel and stick (9"x33') for $32. What do folks here think about MFM's peel and stick? Is it as good as the Grace products? I'd like to save money, but not if it could cause problems.
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