Sunday, July 18, 2010

Mid Century Modern Flat Roof Replacement - Day 2

With a short delay due to weather late last week, work reconvened on the roof early this past week. Day 2 was dedicated to finishing most of the low sloped roof. Luckily this area had been found to be in great shape. A couple of 2x purlins here and there have needed replaced. The existing redwood fascia is going to need some remediation as expected as well. To the left a view of the open structure and beginnings of the batt insulation installation.

The two most critical areas of a flat roof are the flashing and transition details. Part of day 2 would entail the connection of the roof to the massive brick chimney. Previously the roof was just draped up to brick.

Looking the other way, the crew is busy setting plywood over the insulated area. After the 3/4" T&G plywood is installed, 1" polyisocyanurate insulation board is mechanically fastened to the plywood deck before the new EPDM is glued to the insulation board.

A view of the critical transition of the 'flat' roof over our kitchen to the sloped roof. You can see many things going on in this photo. The old fascia cover peeled away reveals the existing redwood fascia
with the existing membrane roof draped up to a termination bar fastened to the fascia. Needless to say, a very hideous condition.

The insulation installation is kind of a pain as it has to be run under the purlins between the 2x10 joists. On top of that an airspace has to be left above the batt and under the purlins to allow an airspace to keep the roof ventilated. The roofers are doing a great job making sure there are no gaps. The relief on my conscious almost is making me look forward to winter heating, almost.

This is a closeup of one of the recessed bullet ceiling lights I installed a couple years back. Around it the existing aluminum baffling, a remnant of the old radiant ceiling heating system. We took our high efficiency bulbs out of all these fixtures and taped bags to the ceiling at each light inside as a precautionary effort. I'm glad we did, we had a bit of debris fall into the bags.

Day 2 work completion to the left. I'm only able to stop by to check out and photograph the work at my lunch break and at the end of the day. It's impressive to see what can get done by a working crew in 4 hours. At this point we have about 18' of the sloped roof mostly complete end to end. The flashing and painting won't go down for awhile.

To the left, the new rubber flashing condition at the chimney. This looks super clean compared to the previous debacle. Addition splice layers double up the strength and durability of this connection. Note the new perimeter dam of the roof edge. After perimeter flashing is installed, this will keep the roof from overflowing on the remediated fascia.

1 comment:

  1. Thanks for your roof photos.
    Another material for a flat roof is Duro-Last vinyl roof membrane. This white membrane material reflects the hot sun, designed for standing water, minimum field seaming with no chemicals, and can be installed over any existing roof,
    I have had a Duro-Last roof on my Dombar home for over ten years with no leaks.
    Duro-Last has posted my home info at
    Paul Holzschuher