Leaking L-feet and what kind of caulk [RE-wrenches]

August Goers august at luminalt.com
Tue Jul 1 07:09:32 PDT 2008


Troy -

Good question. We've never had a leak with probably about 40 L-feet and SikaFlex based systems installed. However, about two years ago we switched over to all fully flashed systems just to assure that leaks will never be a problem. A lot of research went into this decision. First off, the regular SikaFlex Construction sealant (like the type sold at Home Depot http://www.sikaconstruction.com/tds-cpd-SikaflexConstructionSealantCC-us.pdf ) is not compatible with asphalt products including comp shingles. Call Sika Corp if you want to hear it first hand. The sealant itself is great but it tends to loose its bond with the shingle over the years - I learned this from talking to many many roofers and checking up on our old systems. As long as it was generously applied into all the holes it will probably last a long time but I wouldn't use it again. Sikaflex 1-A 1-part polyurethane elastomeric sealant (http://www.sikacorp.com/tds-cpd-sikaflex1a-us.pdf ) is
 compatible with comp shingles and is extremely durable. We've also been using Geocel 2300 (http://www.geocelusa.com/php/oic/product.php?prdb_product_id=7 ) which has just about every positive attribute imaginable including a 50 year service life. Butyl rubber is a also really durable. 

All that said, we either install standoffs with standard cone style flashings sealed with Sika 1-A or Geocel topped with a storm collar or use Quickmount flashings. Quickmounts are a bit pricey but really fast and low to the roof. 

Oatey flashings tend to crack over the years and they only have a one year warranty.

Interested in hearing what other folks have to say, especially the old timers.

-August



 August Goers


Luminalt Energy Corporation
4000 Irving Street 
San Francisco, CA 94122


Office:  415.564.7652
Mobile:  415.559.1525
august at luminalt.com
www.luminalt.com



----- Original Message ----
From: troy <taharvey at heliocentric.org>
To: RE-wrenches at topica.com
Sent: Monday, June 30, 2008 6:37:07 PM
Subject: Leaking L-feet and what kind of caulk [RE-wrenches]


Hi Folks,

I wanted to survey, out many people have had problems with L-feet  
stand-offs leaking over time?

While there are many newer and better looking stand-off products, the  
prices can run as much as 10x the cost as good old L-feet. When in  
high snow load areas with feet 2' on center, the cost of feet could  
get out of control very fast. Any reasonable cost flashed methods that  
you've come up with?

The second survey is Silicone or Urethane sealants, which is your  
favorite for sealing lag screws and why?

-Troy Harvey



On Jun 30, 2008, at 4:43 PM, Dan Brown wrote:

>
>
> thanks for the reply. single phase 240V. db
>
> Dan Brown
> President
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