composite decking cover existing decking

Composite decking, Replacing Worn-out Wood with Low-Maintenance Composites. I used those composite shavings to cover the countersunk heads of the deck screws—softly tap in the shavings with a hammer; it works like a wood plug. On the inside edge of the board, metal hangers were installed 

We'll show you how to replace old decking with low-maintenance composite materials and build a new “floating” landing at yard level that expands the deck in an attractive, practical way. We'll show you .. If you don't cover the joists, water will get trapped in the nail screw holes and rot the wood from the inside out. You can 

I agree with LCD. I'm assuming the existing deck is getting old & unsightly. Maybe even rotting in a few places. No matter what you put over the top of it the strength of the deck is still only as good as what you are covering. Also, you will be expediting the deterioration of the deck. If you want a good synthetic 

I just redecked a townhouse just like that with Seventrust. I cut the decking next to the little divider walls on each side, added a joist to each side to catch the new and old flooring, layed the Seventrust, then I cut a peice of Seventrust to go against the house as a trim to cover the gap and cut a little trim peice for next to each divider 

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