Topic: Compressible DPC/Foam Air backer under bottom plates of wall framing

Compressible DPC/Foam Air backer under bottom plates of wall framing 

Just wondering if anyone had any thoughts of having a compressible DPC under the bottom of external wall timber frames.

Having seen some less than desirable concrete slab finishes/levelness, where a vertical variation of 1-2mm is relatively common. If the timber bottom plate is the placed onto this concrete and if a typical constrcution detail is followed where the timber frame(with DPC on bottom plate) is then placed directly onto the concrete, you then clad the outside, and line the inside, would this then mean there is absolutely no barrier between the outside world and the inside world ie air pressure ocould force the air under the wall and into the house? Especially where the concrete has been poorly finished.

Some thoughts i've had on remedying this:

*Compressible DPC on bottom plate
*Foam backer rod stapled to underside of DPC (or between DPC and timber)
*Applying sealant bed to bottom plate/Concrete floor junction - similar to GIB's requirements for acoustic insulation (may have problems with good adhesion if concrete is damp/dusty?)

Anyone have any thoughts of this, or know of any products available to sort this out? While it seems almost to be a no brainer in terms of a relatively quick/cheap/easy fix -Is it worth the hassle?

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Not a hassle but a very essential thing. It is self expanding foam tape what you need there.
Very important component of the thermal envelope and done overseas for decades..

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

yes ,i use silicone sealant afterwards.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

case, I would strongly recommend to you to change to self expanding foam tape. It is about 2 mm thick when you apply it and it expands to an x amount of thickness within 24 hours depending on temperature.
Silicon relies on adhesion and it can break if the timber smoves or the concrete wasn't clean.
The foam tape seals through compression and it is therefore more reliable.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

+1 to Guess's comment, silicone sealant is completely useless in this situation. Expanding foam gun would be the second choice, but I'd go for tape as the first option.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

expanding foam dosnt work in thin joints very well.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

but tape does :-))

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Is there a product like this available in NZ?

Thanks,
Dejan.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Oops... I meant to post the link to the product:

http://www.tremco-illbruck.co.uk/products/00861_index.html

I have put my Kingspan roofing panels on the compressible butylen tapes for the air tightness all around. Seems to work very well.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

I import selfexpanding foamtape myself from illbruck and greentech (VBH)

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

I should have known it! :-)

When you do the next order, can I get a few rolls ordered?... By the way, proclima is apparently manufacturing some of the Illbruck/Tremco products... particularly the window sealing expandable tapes. Maybe it is a more economical way of getting those in as they ship bigger quantities (I guess)...
Worth talking to Thomas from proclima...

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

So, GW did you give Mr Momcilovic a discount for his free promo?

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Have you been drinking or what ????

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

You have been complaining about GW comments on the other thread, so not really sure what your motivation is to write this stuff. You're not really making a remarkable example.
Anyway, still not managed to get the product... GW did not want my business or did not take me seriously. :)

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

My motivation was to hopefully stop his and your regular attempts at ridicule by pointing out that you either deliberately or inadvertently put in a plug for his company and its products.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

I don't know GW or his products or his company. I have asked him to contact me on this forum, but he never did.
I look for better practices and for better products and that is why I come back to this forum.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Dejan, I will be in contact with you soon, but one has to be very cautious as there are always "people" like samohT appearing who can offer no technical know how or advice but bad rants against those who studied properly for their trade. He is most likely a hammerhand who worries only about his big boat and holden ute but doesn't want to think about his work or whether is makes sense or not!!!

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

samoT Still waiting for a post from you which shows some of your technical know how!!!
And I have posted the gib link before Dejan.
Why don't you go to CHCH and find out why bracing a house with gypsum and paper makes no sense.....

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

This is going seriously off topic but since you ask...
I'm not an expert on leaking buildings and I know enough to not trust your anonymity (until last night at least) and obvious and bias, so instead I look for the published views of experts.
Here's a link for you.....

http://tinyurl.com/9dtdyrp

The problem in that case was the builder etc not following the product certificate and technical literature, the council not inspecting it properly, and finally and most interesting of all the weathertightness inspection 'expert' (his words on his website) doing a poor job and then the remediation 'expert' (same guy - same claim on his website) inappropriately using flashing tapes and not getting a building consent for his work. Look for his name in an ongoing case involving his local Porirua Council.

Now you provide a link to a NZ tribunal or NZ high court determination that justifies your many slanderous claims against a number of NZ companies.

Perhaps you include the Weathertight Homes Tribunal and High Court in your corporate conspiracy theories!

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

I don't need to make theories for what I see myself.
The building code allows very low standards and NZ companies tend to edge along what is legal at the given time.
Defense by denial is the standard methods in an industry which is driven by ignorance of basic building science for the sake of fat profit.
But why discussing with someone who is in constant denial mode??? I gather you are involved in the "establishment" and people like you are the reason why I don't trust the majority of the building related NZ companies......particular the large ones who have only one answer to critical questions... LAWYERS.
And if you think about to send lawyers after us you need to read properly to find that the gib issue has been raised publically by Br.... and not me !!!!!! or Dejan or others representing new ways of house building.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

What was it you were saying about rants?
Like I said - conspiracy theories!
Perhaps you should re-read some of you almost 500 posts. It was you & not Dejan or anyone else who posted:
And their slogan:........ha, ha, ha

Juvenile and trite at the very least
Your sounding very paranoid now - don't forget your posts as Anonymous can probably be traced to your new GW alias if you are still using the same url. They can certainly be linked by your language characteristics and hobby-horses.

I love your marketing campaign so far ....shouting posts.... denigration of others so you are unable to speak openly about your own products and services...very clever. I don't think the majority of the industry trusts you in return especially since some didn't know who you were until this thread.

samohT konD

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Have I missed something...I don't know who GW is or what company or products he represents! I am curious , as , I expect, quite a few other people are.
GW's posts have been blunt, that's true, but I'm not so sure they are slanderous. His (or her?) comments are mostly opinions but also informative, I have no problem with most of GW's posts (perhaps an odd personal attack has crept in though GW!!, so we could do without reading those from anybody).

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Nikoftime It's not surprising that you and others want to know who GW is since his posts have dominated this forum for the past two years and more. Other frequent posters have nearly all revealed themselves or at least mentioned their profession. It's a credibility thing - how can you trust someone who finds it necessary to hide from his what are at best 'blunt' statements. Perhaps you need to have kept a record of all 490 posts like we have and observed the common threads running through them where he makes regular efforts to ridicule in his juvenile way two particular organisations. He just won't let it go and move on. Others in the forum inflame those defamatory statements with posts like '...is that what GW has been taking about...'. He in return posts back similar talk-ups, so it has perhaps given him and others more recently a false sense of security. If he has not defamed any person or organisation then he ought to be able to reveal himself so you can assess for yourself if he has any ulterior motives. If he can't then can he explain why he can't?. The window hobby horse is a deliberate diversion to hide his regular but less frequent references that reveal his true connection with the building industry. He even has to hide the city in which he is based. Look through his posts that are still available and you will see what I mean.
One of the easiest ways to work it out is to look at the list of forum sponsors and check through the ones who ought to be regular participants but are mysteriously absent from threads that ought to interest them.

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

Whoever you are, keep your head in the sand.
I don't need your lectures or assumptions nor this forum. It can turn now into a pink sky platform without discussions and debate, because I am out of here for good.
My know how is well appreciated by my clients who pay for my products and know how and recommend me, because I say it how it is without any pink or honey in it. And I give solutions which are very safe in health, thermal efficiency and weathertightness and far beyond code.
Never argue w....................

Re: Compressible DPC/Foam Air backer under bottom plates of wall framing 

SamohT, sounds like you have your conspiracy therory hat well in truly on!
Research, research and you'll finally (maybe) piece it together that what GW has been on about is true.
As you say, keep to the topic!