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Sips Installation

Last Post 11 Sep 2008 03:14 PM by JBS. 7 Replies.

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speedyj

New Member

Posts:6

01 Sep 2008 12:49 PM
I have been researching the Murus SIPS installation and I have a been a little confused. I know with conventional framing if you were to contruct from 2X4's then your sill plate has to be a 2X4 as well. From what I've been reading on the Murus SIPS is that they fill inbetween the OSB baords 3" of there faom and the use 2 sheets of 7/16" of OSB one for ext and one for internal and the width of the SIPS is 4 1/2". So, my question is do you use a regular 2X4 sill plate or does MURUS supply the sill plate with there installation? I have seen basic drawings of how the SIPS gets installed and this is what I've seen. Sill plate is installed top of foundation then there is another 2X? that gets nailed to the top of the sill plate, then you apply some sort of caulking (insullation), then the SIPS itself is supposed to fit between the the sill plate. If they fill there OSB baords with 3" of insulation how can there be enough room for the SIPS to fit over the sill plate whiich is 1 1/2"x 3 1/2" (2x4). Thanks

cmkavala

Veteran Member

Posts:4327
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01 Sep 2008 01:23 PM
Posted By speedyj on 09/01/2008 12:49 PM I If they fill there OSB baords with 3" of insulation how can there be enough room for the SIPS to fit over the sill plate whiich is 1 1/2"x 3 1/2" (2x4). Thanks the insulated spline is 3" short......1-1/2" top & Bottom

Chris Kavala<br>[email protected]<br>1-877-321-SIPS<br />

speedyj

New Member

Posts:6

01 Sep 2008 01:46 PM
So do you rip the sill plate to match the outer width of the SIP? Does the SIP manufacter prove the 1 1/2"x 3" insert into the SIP? Does the SIP rest on top off the sill plate or does it inclose the sill plate. Here is a link where it sits on top of the sill plate, but I've seen other drawing were the SIPS cover the sill plate as well. http://www.murus.com/pdfs/Murus-PUR-Install-Manual.pdf , Drawing is on page 16 in pdf file.

rnortman

Basic Member

Posts:112

01 Sep 2008 06:03 PM
I think you should double-check your math. Their 4-1/2" panel has 3-5/8" of foam insulation, with two layers of 7/16" OSB. 7/16 x 2 = 7/8" total OSB 4 1/2 - 7/8 = 3 5/8 3-5/8" is a perfect width to fit over a standard 2x4, with just a little bit of wiggle room. Or does Murus make a 4" panel? I thought only Thermocore did that. If they are 4" panels, you'll need rip the 2x4's. I don't know if they provide the ripped lumber as part of the package.

JBS

New Member

Posts:13

02 Sep 2008 02:17 PM
The connection detail at the bottom of a Murus wall panel is no different than what is standard in the SIP industry. The image in the Murus installation manual that you are referrring to is for wall panels installed on top of a concrete foundation, which will always need a PT sill plate. The width of the sill plate is not important as long as it is at least as wide as the panel itself. If the panels are being installed onto the floor deck (as in fig. 4A at the top of the page), no sill plate is required, only an inlet. The next part of the installation detail shown on page 16 is for an "inlet" fastened to the sill plate. The inlet will be standard dimensional lumber, i.e. a 2x4 for a 4 1/2" panel and a 2x6 for a 6 1/2" panel. The exception is the inlet for a Murus 5 1/2" R-33 panel, which calls for a ripped down 2x6. Note: Murus does not supply the 2x lumber. Jay Shultz The Murus Company

speedyj

New Member

Posts:6

02 Sep 2008 06:46 PM
Thanks to everyone who provided me with the required information I needed. Thanks,

tmsu

New Member

Posts:76

10 Sep 2008 05:28 PM
Posted By JBS on 09/02/2008 2:17 PM The connection detail at the bottom of a Murus wall panel is no different than what is standard in the SIP industry. The image in the Murus installation manual that you are referrring to is for wall panels installed on top of a concrete foundation, which will always need a PT sill plate. The width of the sill plate is not important as long as it is at least as wide as the panel itself. If the panels are being installed onto the floor deck (as in fig. 4A at the top of the page), no sill plate is required, only an inlet. The next part of the installation detail shown on page 16 is for an "inlet" fastened to the sill plate. The inlet will be standard dimensional lumber, i.e. a 2x4 for a 4 1/2" panel and a 2x6 for a 6 1/2" panel. The exception is the inlet for a Murus 5 1/2" R-33 panel, which calls for a ripped down 2x6. Note: Murus does not supply the 2x lumber. Jay Shultz The Murus Company Jay, Question for you. Why doesn't your company supply the 2x lumber? The company I purchased my SIPs from didn't either and I thought that strange. Only because I figured for a mark-up the SIPs company could make some "easy" money while at the same time provide that service to the customer. Not a loaded question as I am sure there is some logic. Just curious.

JBS

New Member

Posts:13

11 Sep 2008 03:14 PM
tmsu, Murus is a major manufacturer of SIP panels and we often need to remind ourselves to stay focused on what we do well, making quality panels. Most of our projects are installed by builders and purchasing lumber is something they do as a regular part of their job. The builder will need to order a load of lumber for the interior framing either way. From our point of view, the lumber is just one more thing to fit on the truck and a way to make a mistake on a customer's order. One point to remember is how Murus makes its panels, specifically its polyurethane panels. When the polyurethane is injected, the only wood material involved is the two skins of OSB. Murus does not imbed headers or posts during the manufacturing process. This insures a uniform and constistent flow of the polyurethane foam throughout the entire panel. There are a number of pros and cons to this issue and I understand completely why some companies choose to make the 2x lumber and header material part of the SIP package. I hope this helps. Jay Shultz The Murus Company