Replies

1. 
   PedroTheMule | Jun 02, 2009 07:03pm | #1

   Hi Davide99,

   1" foam and installing 2X furring strips vertically attached to the studs through the foam with 4" grk screws

   Are you sure the rep fully understood what you're doing?.....Reason I question is that I can't imagine a better solution.....maybe he thought you were only using 3/4" furring and would end up with some of the foam over the strips.....that would be an odd assumption but you never know.

   Personally I'd have done it and never asked the rep but then again it's always nice to CYA.

   In case you haven't thought through another little detail.....I'd cut as much of my furring and foam to size first then start at one corner with a perfect piece of straight level furring, run a thin bead of great stuff along the edge of the furring, press the foam panel against it and secure, then another thin bead on the opposite edge of the foam board, press the next piece of furring against it and continue all along.....this will provide a better weather seal that simply trying to perfect cut and fit each foam panel between furring that has been pre-attached.

   Pedro the Mule - You'll love the new energy bills

2. 
   homedesign | Jun 02, 2009 07:39pm | #2

   David,

   The downside that I see is you may be losing the benefit of ventilating the cladding.

   Dr. Joe thinks the ventilation aspect of the rainscreen is important.

   http://www.greenbuildingadvisor.com/blogs/dept/building-science/bs-podcast-rain-control-energy-efficient-buildings-part-1

   I am still scratchin my head on that subject ... there is a horizontal ventilation channel built in by virtue of the lapping design.

   Question is .. is that enough?

1. 
   PedroTheMule | Jun 02, 2009 10:25pm | #3

   Hi homedesign,

   The downside that I see is you may be losing the benefit of ventilating the cladding.

   Dr. Joe thinks the ventilation aspect of the rainscreen is important.

   Now if that's the case the rep is talking about....it would probably have been nice for the rep to make a point of that.....wouldn't it be nice if the world was that simple hahha

   Ok, so let's say that's the case...what if he were to use 1" between the 1 1/2" furring and used foil faced foam......he'd get the rain screen and a radiant barrier as a tradeoff to a bit of R value.......could also put a coat of radiant barrier paint on the furring to help protect it from soaking up moisture

   Pedro the Mule - Good thought on the additional rainscreen to protect the furring

1. 
   DaveRicheson | Jun 02, 2009 11:34pm | #4

   I think the rep is taking the 1" Hardie foam limit to far since the siding is being attached to furring strips. The 1" limit is for Hardie f/c siding attached directly to the foam.

   He may need the ventilation (rain screen) to help the furring dry out if it gets wet, but I'm not sure that the Hardie siding would need it. I thought that was the big selling point about f/c siding. If it get wet it won't rot.

   Maybe Mike smith will cruise through and offer his opion.

1. 
   PedroTheMule | Jun 03, 2009 02:27am | #6

   Hi DaveRicheson,

   I thought that was the big selling point about f/c siding. If it get wet it won't rot.

   Yeah, first time I saw this product....gosh what 15-20 years ago...whatever....the sales rep came by one of my clients construction offices......pulls a 5 gallon mud bucket out of his truck....fills it with water, drops a piece of this new fangled stuff called Hardie in it and says he'll be back in two weeks to take an order. Leaves the bucket full of water right there in the middle of the office floor. Pretty good sales pitch.

   Pedro the Mule - Fireproof, Rotproof, Bugproof....hmmm sounds like an Ellie Mae Clampett Donut

2. 
   homedesign | Jun 03, 2009 12:10am | #5

   Hi Pedro,

   I like the way you think..and your clever taglines.

   Assuming the extra  (vertical) ventilation is a good idea (still thinkin on that)

   How about your idea except use felt strips instead of paint over the furring...

   that way the felt could wick the moisture to the (vertical & horizontal) ventilation spaces

   Lstiburek considers fiber cement a reservoir cladding and recommends ventilating the cladding and the furring strips.

    

1. 
   PedroTheMule | Jun 03, 2009 02:44am | #7

   Hi homedesign,

   I like the way you think..and your clever taglines

   Thanks, I manage to tick one or two off along the way but it's rarely intentional. I want everybody fat, rich, happy & healthy. I'll do my best to do anything and everything I want without infringing on your peace and well being and I expect none the less out of everyone else. In the mean time if we ever find ourselves in the same neck of the woods I hope we can have lunch....preferably something we found on the highway cooked over real oak coals......hehehehh

   Got a neighbor asked me last week how long I'd be runnin' my power washer as he was gettin' ready to have a pool party. I told him I'd trade him out....I'd shut down my power washer if he'd stop mowing Sunday afternoon's when the temp and humidity were perfect for a hammock nap. He agreed and I got a good nap in the next afternoon. I think people get defensive way too fast. Enjoy life, enjoy one another and don't forget to dine outdoors often.

   How about your idea except use felt strips instead of paint over the furring...

   I like that for drainage.....maybe paint and felt....the idea for the aluminum radiant barrier paint is that the stuff is soooo thin and soaks deep into the wood.....not as good as pressure treating but would help seal the wood....and then as you stated the felt would help disperse the water.

   I really enjoy looking at multiple ideas like this.....I'm putting together ideas for my perfect retirement house right now....of course it'll be outdated as soon as I finish but that's ok I'll still enjoy it.....looking to go off the grid, solar, wind, water, etc.

   Pedro the Mule - Cook it, Blow it, Wash it, ahhh what a fine home

3. 
   Piffin | Jun 03, 2009 02:44pm | #8

   I would use 1" under the 2by furring, then 1" in between the furring.

   That way you have the drainage plane.

   The old masonry was considered both firestop and draft-stop insulation back then. Possibly rodent barrier too.

    

    

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