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Question DetailsAsked on 6/18/2017

I am removing a degraded deck that was placed over ice and storm protection on the joists. I am now replacing my

old deck with Versa Deck aluminum planks over Dek Drain over-the -joist EPDM rubber roofing rain protection. Does anyone see a problem with doing that? EPDM rubber generally is not compatible with asphalt products however my ice and storm covering is 15 years old and in good shape. The majority of oils have probably dried out by now. Do you think I will have a problem here with the EPDM rubber coming into direct contact with old ice and storm covering? To make certain I thought I would paint the hard to remove the ice and storm covering with acrylic latex paint. Any opinions at advice here?

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1 Answer


I am afraid I am not clear on the layering here - aluminum planking over Topside (over the joist) Dek Drain, then EPDM AND ice and water shield ? Bit of overkill there ?

You don't say what is deteriorated - presumably not the aluminum planks, so I am not clear on what deck elements you are replacing.

I would use either EPDM or Ice and Water Shield over the joists - not both - but if the Ice and Water Shield is adhered to the EPDM (or vice-versa) I don't imagine if it looks in decent condition now that will deteriorate much more from the asphalt - most Ice and Water Shield does not have a lot of volatiles in it.

One concern - sealing any fastener holes in the shielding because the new decking fasteners are almost certain not to land in the exact same holes - and actually probably should not for best holding power.

I would just tear it all off, repair and joist damage, retreat with the touchup chemical if treated wood, then put on new strips of ice and water shield (I swear by WR Grace Ice and Water Shield) over the joists, then your new decking system. I cut the ice and water shield 1/2" wider than the joists so it overlaps 1/4" on each side - that allows it to droop down enough that it acts as a dripedge, but not so far (over time) that is lies alongside the joist and runs the water down the face of the joist. Some people cut the shield and do not peel it, just spot staples to holdit during the decking - others do the peel and stick though that does take longer. Avoid splices over the length of the joist to prevent tilting of deck boards due to the doubled thickness at the joint, and remember to turn it up at the house end so drainage can't go that way along the board.

Answered 3 years ago by LCD

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