Re-framing a flat roof in preparation for
a new rubber membrane

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For an existing addition on a circa 1912 residence in Newport, RI

Part I

Part II

Part III you are here

Thats me hauling the R-38 insulation up the ladder.

Filling the 2x10" rafter bays with a nice blanket of insulation.

To get a definite pitch for runoff I'm ripping 18' 2x8's on a diagonal

Looks easy enough to get a nice pitch. The framing below however is far from flat so lots of shimming will be required.

Setting the new pitched rafters to stretched masons lines every 4 feet told us exactly how much shim action was needed at a given point. This is how to get a perfectly flat, no puddle roof with a 3" pitch.

Once every rafter was shimmed to the lines, Alan nailed them off as I filled in the shimming between the lines.

It would have been a back breaker to lug up 20 sheets of 3/4 CDX plywood. Thankfully JT lumber in Middletown has a boom truck.

Before insulating where the old porch hip roof was we need to add some framing for a new skylight for the bathroom below (which has no window) and a 12' 2x12" to stiffen the new roof framing in this area.

It feels good getting this plywood down. Now we have a very strong and perfectly flat roofing deck with a 3" pitch for runoff. (Did I just say deck, lol.)

This addition looks like a floating box. Roof overhang with new cornice will make this look like it was added on in 1900, not 1960.

This 20'x35' roll of .060 rubber weighs a little over 300 lbs. They are predicting rain showers tonight and tomorrow, so we called in the big guns again.

Steve looks on as Alan directs the big Peterbuilt for a perfect landing.

Before rolling the rubber out, we belt sanded all the plywood joints to remove any irregularities.

The 20 foot wide sheet comes folded over on a 10 foot roll.

Once the rubber was relaxed we folded it back on itself and applied the bonding adhesive.

Ahhh! A perfectly flat roof with 3" pitch over 20'

Alan Bettencourt deep in thought after a job well executed.