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Posted by davidlaska on September 10, 2006, 9:09 pm
Don Young wrote:
> >
> > Don Young wrote:
> >> >I have a metal roof made with used metal sheet (2x9 feet) and there are
> >> > holes from previous fasteners. I tried silicon, tarbased stuff, butyle
> >> > but examining then weeks later I felt that it will not do the job when
> >> > the rains come. I bought a role of 4 inch by 50 eternabond tape and
> >> > cut pieces for the holes. It seems to stick very well and has a UV
> >> > backing. It is marketed for this purpose. Has anyone had experience
> >> > use this product of mental? ( Like all products, the surface must be
> >> > clean, free of and so on)
> >> >
> >> Yours may not be, but metal roofing is normally applied over a waterproof
> >> underlayment of some sort with some means of ventilation under the metal.
> >> If
> >> so, any small amount of water under the metal will simply evaporate.
> >> Metal
> >> roofing can get a lot of water underneath just from condensation.
> >>
> >> Don Young
> > metal sheet laid over 1 x 6 planks space 6 inches apart, very old house
> > for california (ww 2). original roof was singles only, nothing else,
> > just nailed to 1 x 6 which were removed for metal.
> >
> Old houses, sheds, and barns were normally built without any solid decking
> under the metal roofing sheets or wooden shingles. Some rain water and
> condensation would drip at times but the ventilation was enough for it to
> dry out without causing any problems. You can try the tape to seal the
> holes. Another possibility would be to use sheet metal screws with rubber
> gaskets or some kind of sealer. The main hazard to any kind of sealing
> material is the sun. Expect some drips from condensation and wind driven
> rain at times.
>
> Don Young
Sun pretty much can be harsh on everything. The tape come with a
separate but attacked laye r of UV resistant material (It has the look
and feel of the plastic protector under the cover of scanners and
copying machines. They come in three colors, white grey and black. I
figured the white would reflect more harmful rays than black and stay a
lot cooler.
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