[RE-wrenches] Mounting to metal roofs and thermal expansion

[Troy Harvey]

I'm planning on flashing the bottom of the foot with urethane sealant,  
then screwing down to the roof. After that, counter-flash with a ITW  
metal roof flashing boot glued down only with a sealant (doesn't make  
sense to add more holes to flash). I'm considering adding a weep hole  
at the bottom in the counter flash boot on the down hill side.

As for the European foot, it is made by TiSun. They use a large metal  
plate that screws through the hole cut in the metal roof, the metal  
plate overlaps the roofing with a rubber seal held in compression  
against the metal roof by the force of the screws.

But, yes it makes me nervous to cut a roof


Troy Harvey
---------------------
Heliocentric
801-453-9434
taharvey at heliocentric.org


On Feb 7, 2009, at 3:09 PM, William Miller wrote:

> Troy:
>
> How are you planning on attaching the rubber boot to the roof  
> sheeting?  If you attach with sheet metal screws, won't your screws  
> penetrate into the sheeting and trap the metal in place?  If you  
> glue it, you are dependant on the glue.  I see the overall concept,  
> but don't see how to attach a boot (pop rivets???).
>
> Wm Miller
>
>
> At 11:24 AM 2/7/2009, you wrote:
>
>
>>  and use an
>> overlapping rubber seal so the roof can move independently of the
>> mounting foot.
>
> Please note new e-mail address and domain:
>
> William Miller
> Miller Solar
> Voice :805-438-5600     Fax: 805-438-4607
> email: william at millersolar.com
> http://millersolar.com
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