A Carpenter’s Journal

August 30, 2009

3-Season Porch

Filed under: Job Progress — Tags: , , — admin @ 8:30 am

This shows the plywood panels and the hold downs

The plywood panels and the hold downs

We are building off of an existing deck supported at 6 points by 8 inch diameter concrete piers.  The first thing we had to do was to level the entire deck.  We had to add footings across the front and provide anchors against uplift forces because we are in the 110 mile per  hour wind zone.  We had to reinforce some of the joists whose spans exceeded the limit, then we used pocket screws to attach pressure treated strapping to the bottom of the joists  so that we could lay in plywood panels, (also pt), to prevent the entry of small animals into the insulation. We used a spray foam closed cell insulation three inches thick in the bays.   This gives an R value of about 20 and the insulation is impervious to water.

 

 

Close cell foam insulation in the bays

Close cell foam insulation in the bays.

 The windows and doors are Windsor, Pinnacle series.  They were purchased directly by the owners from Horner Millwork in  Pembroke.  The sheathing is from the new Zip system which is popular now.  This is the first time we have  used it.  The Zip tape on the seams is sufficient with the coating on the panels themselves to serve as a wind barrier.  Structurally the panels are not as strong as cdx plywood. 

Roof is shingled, windows and doors in

Roof is shingled, windows and doors in

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