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

[Topher Belknap]

Greetings,

I assumed so, given the code you are using.  The point of 90° and 70%RH 
was that is likely the greatest amount of moisture that could have been 
included, if building in the peak of summer.  If you have gotten more 
leakage than that out, it can NOT be latent moisture under any 
circumstances.

Thank you kindly,

Topher Belknap

-- 
Topher Belknap
Green Fret Consulting
http://www.greenfret.com/
(207) 882-7652

On 1/8/2024 8:42 PM, Lynelle Hamilton wrote:
>
> 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
>>>
>>>
>>
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