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  #1  
Old 1/12/14, 10:54 PM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default PWF

I inspected a Permanent Wood Foundation today where the customary 6 mil polyethylene exterior moisture membrane was an ice and water shield type.

My first thought was that is better than poly but I would like a second opinion. The missing plywood strip at grade level was noted.

Thanks!
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  #2  
Old 1/12/14, 10:57 PM
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Default Re: PWF

Never saw a wood foundation.
Have any shots showing the actual wood ?

If that 6 mil rips is the wood exposed and prone to rot ?
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  #3  
Old 1/13/14, 12:15 AM
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Default Re: PWF

I think of them as Powdered Wood Foundations and disclaim them. Only seen two, both bad and I don't trust them. Proper inspection requires probing through the ground around the foundation with a 6' metal rod. My understanding is that they can last a while, maybe 30 years, if built correctly, but that's a big IF and failure to build correctly turns one of the major structural components of a building to mush in not much time. They're the Yugo of foundations in my opinion.




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  #4  
Old 1/13/14, 6:37 AM
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Default Re: PWF

Same here with never having seen one in person but can't imagine they would last long especially in the climate up there
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  #5  
Old 1/13/14, 8:24 AM
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Jeffrey R. Jonas Jeffrey R. Jonas is offline
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Default Re: PWF

http://youtu.be/AwJlyd-g6X8
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  #6  
Old 1/13/14, 10:00 AM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Re: PWF

Quote:
Originally Posted by belliott View Post
Never saw a wood foundation.
Have any shots showing the actual wood ?

If that 6 mil rips is the wood exposed and prone to rot ?
Not too many around here either but they are cheaper to build than concrete and are more popular in remote areas.

If that 6 mil rips, the wood foundation is compromised and prone to rot. As we know even treated wood rot.

Some good info at link below, click on Publications, PWF Design & Construction Guide (you must provide an email address to gain access).

http://www.southernpine.com/



Marcel Gratton, NACHI04011210, CMI
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Gatineau, Québec
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Last edited by mgratton; 1/13/14 at 12:12 PM..
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  #7  
Old 1/13/14, 10:01 AM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Re: PWF

Quote:
Originally Posted by jjonas View Post
Good video Jeffrey, I'll send the link to the client.

Thanks,



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  #8  
Old 1/13/14, 11:19 AM
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Default Re: PWF

About 80% of the homes here have wood Foundations here. I have built hundreds myself. Poly on the exterior is not required as long as there is a moisture barrier of some sorts. We use a waterproof bitumen here. Tar all of the nails and joists first and then two to three coats of the bitumen. We do not use The grade level plywood strip as the engineers do not require it here. I know that PWF foundations get a bad wrap most of the time but I can honestly say I see more issues with concrete then PWF.



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  #9  
Old 1/13/14, 12:12 PM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Re: PWF

Quote:
Originally Posted by gmathias1 View Post
About 80% of the homes here have wood Foundations here. I have built hundreds myself. Poly on the exterior is not required as long as there is a moisture barrier of some sorts. We use a waterproof bitumen here. Tar all of the nails and joists first and then two to three coats of the bitumen. We do not use The grade level plywood strip as the engineers do not require it here. I know that PWF foundations get a bad wrap most of the time but I can honestly say I see more issues with concrete then PWF.
Thanks for the info Greg!



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  #10  
Old 1/13/14, 12:23 PM
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Default Re: PWF

Only good location for a PWF is on the top of the hill. However if done correctly in the right location it will give less trouble than some concrete foundations.
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  #11  
Old 1/13/14, 12:26 PM
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Jeffrey R. Jonas Jeffrey R. Jonas is offline
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Default Re: PWF

Quote:
Originally Posted by gmathias1 View Post
About 80% of the homes here have wood Foundations here. I have built hundreds myself. Poly on the exterior is not required as long as there is a moisture barrier of some sorts. We use a waterproof bitumen here. Tar all of the nails and joists first and then two to three coats of the bitumen. We do not use The grade level plywood strip as the engineers do not require it here. I know that PWF foundations get a bad wrap most of the time but I can honestly say I see more issues with concrete then PWF.
Required by the engineer or not, missing grade level protection is always called out in my reports. It is (supposed to be) there for a reason! Whenever I see the protection is missing, 9 out of 10 times there is damage from lawn mowers and weed whackers!
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  #12  
Old 1/13/14, 12:26 PM
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Default Re: PWF

Quote:
Originally Posted by kwood View Post
Only good location for a PWF is on the top of the hill.
Completely disagree with this statement. If built properly they are good in any location.
Have you Inspected many in your area?



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  #13  
Old 1/13/14, 12:30 PM
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Default Re: PWF

I would be calling up every home I inspected if I called up the grade level protection. The parging is there to protect it. That is mandatory in our area as the UV light can break down the plywood fairly quickly.



Greg Mathias, CCHI
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  #14  
Old 1/13/14, 12:38 PM
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Default Re: PWF

Not as many as you but I have seen them sink crack lift on clay soil. Unfortunately here in SSM clay is everywhere. I would not use any PWF that might get wet for a period of time during flood season. Also Parging or Damp proofing is very minimum protection in my mind and will not stop water like a cement foundation will with proper draining and foundation dimpled protection.
http://www.supersealonline.us/catego...6-Accessories/

Last edited by kwood; 1/13/14 at 12:45 PM..
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  #15  
Old 1/13/14, 7:08 PM
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Default Re: PWF

Kenton is has let two PWF affect his opinion.
He needs re education.

That is all.



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