[Greenbuilding] ***SPAM*** Re: ***SPAM*** Steel Roof Question

[Lynelle Hamilton]

Thanks, Topher. I should have added that I am in Bracebridge Ontario, 
definitely a colder climate zone (45th parallel)

On 2024-01-08 8:31 p.m., Topher Belknap wrote:
>
>
>
>
> -------- Forwarded Message --------
> Subject: 	Re: [Greenbuilding] ***SPAM*** Steel Roof Question
> Date: 	Mon, 8 Jan 2024 20:30:54 -0500
> From: 	Topher Belknap <topher at greenfret.com>
> To: 	Lynelle Hamilton <lynelle at lahamilton.com>
>
>
>
> Greetings,
>
> If the latent moisture is hermetically sealed into the space, it would 
> not be able to leak out.  If not, more moisture could of course enter.
>
> Let's consider a sealed volume (which this is apparently not), 16' x 
> 47' x 1' = 750 ft^3.  At 90°F and 70% relative humidity, equals 52 
> pounds of dry air, and 6200 grains of water, about 0.8 pounds (0.8 pints).
>
> Thank you kindly,
>
> Topher Belknap
>
> -- 
> Topher Belknap
> Green Fret Consulting
> http://www.greenfret.com/
> (207) 882-7652
>
> On 1/8/2024 9:50 AM, Lynelle Hamilton wrote:
>> Hope y'all are still out here!
>>
>> I have contracted with someone for an addition to my home. The 
>> addition has a second story with a cathedral roof. The contractor 
>> insisted that I did not need decking and ice/water dam on the 
>> rafters, so installed the purloines directly on them, then installed 
>> the steel roof.  I have installed 3 steel roofs, but never one this 
>> way, so questioned it.  He insists it's the correct method.
>>
>> To meet the Ontario Building code, he said we had to lay 2 layers of 
>> R14 insulation, then install  foil-covered foam board (foil both 
>> sides)on the inner side, seal and tape. I used Rockwook, plus RKO 
>> 3/4" board as per his specs. We have not yet installed drywall.
>>
>> There are at least 10 areas of trapped moisture in a 16x47 foot area. 
>> One is dripping onto the first floor
>>
>> We pulled the insulation from one area and found significant 
>> condensation on the cold steel roof, seeping through the Rockwool and 
>> running down the cold side of the foil covered foam board. The 
>> contractor says this is due to latent moisture in the insulation and 
>> that we've got propane heat in the basement. He says it will resolve 
>> in time.  I don't buy this.
>>
>> Any advice is appreciated.
>>
>> Lynelle Hamilton
>>
>>
>
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20240108/d2c5897e/attachment.html>