Rotten Rafters & Gooped Up Tar Flashing in Entrance


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Old 07-20-08, 10:11 AM
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Rotten Rafters & Gooped Up Tar Flashing in Entrance

Hi there,

20 years ago, a contractor added an entry-way (roofed extension) as an (additional) side entrance to our basement. It is a roughly 4'x5' hallway extending into the driveway with a slightly pitched gabled roof. It butts up against the housesiding and is waterproofed by a gooped up spread of roofing tar. A pyracantha tree that used to overhang this roof got fire blight and we are guessing that that blight "infected" the plywood sheathing, spreading mostly around the edges of the plywood and to the rafters supporting it. Regardless, 15 years of deliberate neglect later, several of the rafters are completely rotted, as are the edges of the plywood.

This is such a small project (40-50 square feet?), we are hoping to do the work ourselves. My concerns are (1) the rotted rafters. Some are too far gone to sister 2 x 4 reinforcements (and any way that really looks bad), but the interior of the entryway is sheetrocked. What mess are we goign to find when we tear off the original plywood sheathing under the shingles?

(2) the contractor who built this entryway extension used roofing tar instead of metal flashing to seal the seam where the entryway roof meets the ship lathe siding. He really layed it on. How can we most easily remove it?

Thanks for any advice on how to proceed.
Frank
 
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Old 07-21-08, 09:40 PM
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Location: rockland county,new york
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I WOULD RECOMMEND YOU HIRE A PROFESSIONAL FOR THAT MESS-HAVE THE RAFTERS REPLACED WHERE NECESSARY,and get the wall flashed properly,the tar has to be scraped,and/or remove that siding,restep flash,and waterproof the wall,and reinstall new pieces of siding as your counterflashing
 
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Old 07-21-08, 09:58 PM
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Thanks--I am afraid it will come to that. Unfortunately, the contractor cut too deeply into the siding which is why I think he used tar to seal the seam. It isn't composite siding--the house was built in 1908 with redwood shiplap (not ship lathe ) siding milled from real 2 x 4s. Can't even buy it any more. Modern shiplap is thinner and the curves smaller. Would probably have to try to get replacement siding milled if that's even possible.

Thanks again.
 
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Old 07-22-08, 07:45 PM
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set the depth on your saw,measure up 6" from the roof,and cut away that much siding,do your waterproofing,and stepflash,then install a dripcap under your siding(top leg-secure w/galvanized finish nails,then insert a 1x6 redwood/cedar fascia type board under the dripcap as your finished counterflashing
 
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Old 07-22-08, 11:05 PM
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Thanks Again!

You are a roofing god!!! We will try to muddle through this repair job per your divine prescription.

If we fail we will hire a professional. Here in the SF Bay Area, everyone charges as though they were a god, but everyone doesn't necessarily merit the god-level rating. Challenging for us mere motals to engage gods on limited salaries stretched to the breaking point.

Thank you again and again.
 
 

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