I never thought of that. That's a good reason not to have three layers of
shingles.

On Fri, Aug 6, 2021, 1:17 PM Allan Streib via Mercedes <
mercedes@okiebenz.com> wrote:

> First house I owned was built in the early 20th century. It must have had
> at least 4 layers of shingles; I don't think it had ever had a tear-off.
> The roof deck was boards, not plywood, installed with about 1-inch gaps
> between them.
>
> The house had been re-sided at one point with Aluminum siding. It was a
> bungalow style house with a covered front porch. After we had the roof torn
> off and replaced, there was about a 1-inch gap between the bottom of the
> siding and the top of the porch roof, that was the thickness of shingles
> removed.
>
> The dumpster they ordered for the job turned out to be too small by about
> half, because there were so many layers of old roofing.
>
> Current code I think limits residential roof to 2 layers, one of the
> reasons is so that firefighters can cut through the roof to vent smoke if
> needed.
>
> Allan
>
>
> On Fri, Aug 6, 2021, at 11:37 AM, Jim Cathey via Mercedes wrote:
> > > Do they not just put another layer of shingles on anymore?
> >
> > I was told, from family lore, that you could put on a second layer, but
> not a third.
> > When we finally did a full tear-off of the beach cabin roof, there were
> five layers
> > in some spots.
> >
> > -- Jim
> >
> >
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