Parging/prettying Up A Wood Foundation Covered With Membrane

 
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Old 09-05-2011, 05:59 PM   #1
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Parging/prettying Up A Wood Foundation Covered With Membrane


Hi there.

Have a HO that just had an addition repaired. It's a PT wood floor on concrete posts. The floor sill plate is supporting the brick. (?) ... anyway, it's covered in some tar/ice-shield membrane, and it's visible above grade for about 4". HO wants to pretty it up.

I was thinking to parge it. I was thinking some cement board (screwed through the sill (the membrane is gooey enough to re-seal around the screws), followed by some galv lath, cement/parge over top of that. The parging would extend below grade to the base of the wood, and extend up to just below the brick.

Any pitfalls I should be concerned about here? This is in Ottawa so freeze/thaw is my biggest concern. I may just tell him, that this is the best it's going to get, which isnt much better than looking at an ugly ice-sheild membrane...

Thanks in advance!

Mike
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Old 09-05-2011, 06:19 PM   #2
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


If you can fasten some EPS you can detail better with a Durock/Dryvit type product

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Old 09-05-2011, 06:43 PM   #3
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


Mike, you can cover that with Durock cement board. There are special screws for it. Then parge with their base coat for stucco. This is waterproof and can be used as a finished product. May need two coats.

The product you want mixes with water only.

They also have the tape for the joints. Look up "Durock" for a distributor in your area.

I just did this on my current project. Works awesome. I'll look at the bag tomorrow and post the specs on what I used.
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Old 09-05-2011, 09:53 PM   #4
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


That sounds about right. Does the durock product come out in 'parge' colour or is it darker? Can you finish it w/ a sponge/brush?

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Old 09-08-2011, 08:46 PM   #5
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


Mike, sorry I'm so long getting back to you.

The product is "Durex-polymere modified base coat". It is available through Durabond Products Limited.

This is a base coat for stucco, and as said can also be used as a finish coat.

If you want colour, use this as your base coat, then apply their stucco finish. It is available in many colours. The finish stucco coat is very hard when dry.

I use a plastic trowel and hawk, but you can use a steel trowel also. I apply this in a thin coat and when it starts to dry up I finish it up with a flat sponge float in a circular motion.

This product is meant to go on thin. If you need to build up an area use a cement parging mix first for this.
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Old 09-09-2011, 01:27 AM   #6
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


Thanks John. I'm doing it tomorrow, I'm going to put parging on the exterior - after I put the and mesh and duroc cement. It's mostly going to be underground - only about 4" showing, and it would look out of place if it were anything other than 'parging grey'

I'll let you know how it goes. I have a tendency to put parging on too thick and then it cracks... so I'll be careful. Thanks for the pointers.
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Old 12-30-2011, 05:41 PM   #7
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


Quote:
Originally Posted by sbcontracting View Post
Thanks John. I'm doing it tomorrow, I'm going to put parging on the exterior - after I put the and mesh and duroc cement. It's mostly going to be underground - only about 4" showing, and it would look out of place if it were anything other than 'parging grey'

I'll let you know how it goes. I have a tendency to put parging on too thick and then it cracks... so I'll be careful. Thanks for the pointers.
How did it come out Dude?

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Old 12-30-2011, 08:15 PM   #8
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


It turned out well.

... trying to remember. ;-)

I screwed the cement board to the wood through the membrane, and then used a stucco base coat, It wasn't durock, but a local company that mfr's their own stuff... I used a fibreglass stucco mesh, one quick skim coat, stick the mesh in, and then push it in.

After that, I put a thin coat of parging over it. Looked great, you'd never know there was wood underneath there, and I'm pretty hopeful it will last over the winter/s.
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Old 12-31-2011, 07:39 AM   #9
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Re: Parging/prettying Up A Wood Foundation Covered With Membrane


I didn't think about using EIFS.

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