Replies

1. 
   Tommy_B. | May 25, 2001 12:20pm | #1

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   Mh,

   We use a medium density fiberboard for this application. We attach it with caps and screws that are available from your roofing supplier. About six screws per board.

   I do not believe the insulation is required, provided the existing underlayment is properly attached (screwed) as I have seen others do it that way.

   Get the manufacturers specs from your rubber supplier. It will have all the answers.

   Tom

1. 
   Tim_Kline | May 25, 2001 10:31pm | #2

   *b WBA At Your ServiceEvery premature rubber roof failure I have seen was done with rubber laid over the top of an existing roof. Often there is a lot of moisture in the existing roof that can't get out. It is always best to strip down to the sheathing. The board you speak of is a fibreboard (we call it recovery board) that is sold by the roofing suppliers. It's use evens out imperfections in existing roofs and prevents the nails in the deck from coming through the rubber. A rubber roof should never be laid directly onto sheathing that has been nailed. Screws only. The nails can back out slightly and cause holes.

2. 
   mh | May 25, 2001 10:32pm | #3

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   I am looking for some information in regards to rubber roofs. Do you have to put osmething down on the plywood sheathig before gluing the rubber down. I was watching this old house this winter and they had a contractor that was doing a roof and I thought he installed some sort of insulation first to prevent nails from comming through. The roof I am fixing is a lightly sloped porch roof that was rooled roof about 6 years ago. Any thoughts welcome.