best roofing ice and water shield?

Posted by Smarty on April 4, 2009, 8:44 pm

Roofers I speak to seem to strongly prefer Grace I/W Shield over
Certainteed and Owens Corning btands despite a very big price
difference.

Is the double or triple cost worth it?

Thanks very much !!

Posted by Joe on April 4, 2009, 10:25 pm

> Roofers I speak to seem to strongly prefer Grace I/W Shield over
> Certainteed and Owens Corning btands despite a very big price
> difference.
> Is the double or triple cost worth it?
> Thanks very much !!

Posted by Smarty on April 5, 2009, 10:16 am

The technology of all these underlayments is based on a butyl rubber
adhesive system that has been around for many years. There are similar
sealant products used around windows and doors. If the Grace material
is physically better I would be quite surprised. It does have an
advantage in a faster means of removing the paper backing, which to a
roofer (time=money) is an advantage. That, coupled with an
artificially inflated list price means more profit. For a DIY project
any of the major brands should be just fine. You might check the
different products out at your local lumberyard or box store to see if
there are discernable differences that would make one or another a
better choice. The rolls of the quality membrane will be quite heavy,
making comparisons easy. HTH

Joe

Thanks very much Joe. I certainly would also tend to the heavier material,
all things otherwise being equal. Since I have 2 old roofs being removed,
and literally 20 to 30 thousand nails being removed in the process, I am
also thinking that the heavier materials will also provide a little better
puncture resistance if one or more nail heads are still sticking up from
prior jobs. I am not sure if this makes any sense or not, and perhaps the
felt paper / Titanium UDL underlayment takes care of this issue.

Many thanks again,

Smarty

Posted by Joe on April 5, 2009, 12:17 pm

>snip<

. I am not sure if this makes any sense or not, and perhaps the

> felt paper / Titanium UDL underlayment takes care of this issue.

My roofer sub likes the DuPont product similar to Permafelt from
Menards. I used the latter last summer and it is far better than felt
for that critical first layer. For DIY projects, it will give you many
days of leeway in completing the job and keep the weather out when
unexpected rain arrives. Probably better than felt for water
resistance and safer to walk on when the pitch gets over 4-12.

Joe

Posted by aemeijers on April 4, 2009, 10:30 pm

Smarty wrote:

> Roofers I speak to seem to strongly prefer Grace I/W Shield over
> Certainteed and Owens Corning btands despite a very big price
> difference.
>
> Is the double or triple cost worth it?
>
> Thanks very much !!

I have no personal knowledge as to which product is best. However, if
you are in the trades, 2x or 3x on material price is NOTHING compared to
the time and goodwill cost of having callbacks and rework. One bad job
can cost you 5 other jobs, once they tell their friends. And if the more
expensive material goes in easier and quicker, all the better.

Remember, labor is usually half to two thirds of the cost of any project.

--
aem sends...

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