Water tight deck over a room


I have a 10'x12' deck and want to enclose the lower area for a storage room. For this to work I need to have the deck surface water tight. I would replace the old deck board with new. The only decking I have found that's water tight is aluminum Lockdry ( http://www.lockdry.com/contact.htm ) and it is very expensive.
I'm thinking of using composite decking and cutting a 1/2" spline pocket in the edge of each board. Then installing it using pure silicone in each pocket with a 1/4" x 1 1/4" spline between each board. Leaving 1/4" of the spline showing between each board.
I would use that galvanized angle iron with elongated holes along each joist to screw the boards down from underneath. Placing the screws w/washer in the middle of the elongated hole would allow the entire deck to expand and contract with the weather.
Any comments or ideas.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Here's a few more links. I was going to do the same as you but haven't managed to get around to it yet.
http://www.dekdrain.com/products.asp http://www.dry-b-lo.com / http://www.dryspace.cc / http://www.backyardamerica.com/smartroof.htm http://www.timbertech.com/products/dryspace.aspx
Art

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
We use Dry Space when it is called for under our decks. When installed according to the manufacturers instructions it works great.
Steve P.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.