Problem with Barn attached Deck

Jiles · Sep 30, 2013

My son bought a small farm with tractor storage barn that someone attached an outdoor deck to--really nice. It is about 12' high and he wants to somewhat waterproof under the deck for additional storage.
In the past, I have installed roofing panels under a deck and also installed plastic underneath, but this will be difficult because of the way this deck is constructed.
I am thinking about caulking between the 5 quarter decking boards with 100% silicone caulking or another product that will allow movement of decking boards.
I realize this sounds silly, and I have never heard of this but I can not think of another way.
Any suggestions would be welcome.

Wayne in MN · Sep 30, 2013

After caulking, get some rubber based paint (mobile home roof paint) and put a couple coats on the deck. Works for me on plywood decking over a screened porch the wife likes kept dry.

JRSutton · Sep 30, 2013

I'd think that even though it's soft, its' going to get pushed out between freezing and thawing, and expanding with water. (supposed that depends on where you live)

Just can't picture it remaining water tight for very long. Though I have no idea for sure - never tried it.

Any way you could cover the deck itself with a roof - turn it into a screened in deck? Something to be said for that in the middle of the summer.

ss55 · Sep 30, 2013

If the deck is level, you will get ponding and drainage problems if you try to seal it. That may force water into the barn wall. Install your water proof barrier with adequate slope underneath the deck or build a sloped roof over the deck.

JDemaris · Sep 30, 2013

I built a water-proof deck this last year. Place I've been building in the Adirondack mountains. Not a commonly done type of construction. I found several options. One is a new aluminum decking that has a built in gutter system and is water-proof.

I opted to do mine another way. Conventional framing. Then covered it with foundation-grade pressure-treated 3/4" plywood (not the cheap treated junk like Home Depot sells). Then covered it with a seamless sheet of EPDM rubber. Then used synthetic 6" floor decking board over it that are screwed on. It's pitched 1/8" per foot away from the cabin.

BAnNC · Sep 30, 2013

Normal pitch for exposed flooring used to be 1 in every 10-12 ft.

Janicholson · Sep 30, 2013

It needs some pitch as noted below. Use urethane caulk. Use foam spaghetti crack filler to back the caulk (put it down 3/8") and fill to the top. finger trowel with charcoal lighter fluid to make a nice looking fillet. Jim

Problem with Barn attached Deck

Jiles

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Wayne in MN

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JRSutton

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ss55

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JDemaris

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BAnNC

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Janicholson

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