In small buildings (such as a shed) what is the downside to covering
the entire roof with aluminum flashing before shingling? Perhaps
expensive? That's the only thing I can think of.
Any other negatives?
I want to protect the wood indefinitely.
That was my first thought. If I want a durable shed roof and was willing
to pay the expense, I'd go to the roll-form roofing dealer, and get
panels the right length, and the proper clips and fasteners to tie it
all down with no penetrations through the metal facing the rainy sky. If
you can live with slightly 'off' colors, you can get the stuff amazingly
cheap. PITA to put up without helpers, and make sure everyone has
leather gloves, but quite durable.
There is no point. Flashing is to keep water from coming in seams and edges,
and wicking up from the bottom. It'll do nothing in the middle. If you are
really anal, use "Ice and Water Shield". This stuff is a heavy rubbery sort
of rolled roofing that sticks to the deck and seals the nail holes. It's
commonly used to seal the bottom 4' of a roof deck against ice dams. The
stuff is expensive, but will be a lot cheaper than flashing, which will do
No negatives, just no point to it.
If you're willing to pay for that, just put on a metal roof. It's
likely to be cheaper in the end, and it will outlast all shingles.
It's not that hard to install either on a small and low shed without a
lot of gables and stuff. All you need is the metal, neoprene screws,
a power drill with 1/4" hex tip, and a tin snips. Smaller sheets of
steel are lighter than shingles too.
On Tue, 8 Jun 2010 16:48:42 -0700 (PDT), " firstname.lastname@example.org"
Using chipboard on a roof is just plain stupid. Eventually all roofs
will leak, especially shingles. By the time the leak is noticed the
chipboard is usually ruined. So instead of applying some tar or a
couple new shingles, you end up ripping the whole roof apart. Not
only that, but shingle nails dont hold well in the stuff.
Personally I dont think much about chipboard for ANY buildings. Water
gets to it and its shot. Its fine for cheap cabinets and furniture,
but not for roofs or floors. When I was in the repair business, I was
constantly replacing large sections of floor in mobile homes because
most of them use that crap for the floor. I put my leg thru more than
one of those floors. Usually by doors or in bathrooms. I'd patch
them with 3/4" plywood, and cover the whole floor with 1/2" plywood.
Now, what is bithane? I never heard of it.
Metal flashing under nailed down shingles would be an absolute
waste of time and money. If you would like, you might consider a
full layer of ice shield under the shingles or a standing seam
metal roof. Here is some information about ice and water shield:
Keep the whole world singing . . . .
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