help choosing SIPs in North Est cold climate
Last Post 20 Nov 2017 01:53 AM by kach22i. 8 Replies.
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doctormanUser is Offline
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03 Aug 2017 10:22 PM
my first renovation addition residential project, quite big, trying to make the best house I can for the money. Functional, insulated and low cost to maintain, big enough and good looking. we are in New york cold needing 2 time more heating than cooling per year and many rainy days. of course solar installation top has to be included. the roof is being raised so 2/3 of the building will have new roof from scratch. SIPs variety all with EPS in the middle outside choices: OSB OSB with MgO on top MgO Steel 1) Outside will be stucco like finish, so if I get MgO board on the outside of the SIPs, it will reduce my stucco cost from 12$/sqft to 5$ sqft since I can finish it easily by just 3 layers of paint like material made by CoraFlex or Tess Finish applied directly to MgO. Wondering if this is an issue? 2) if Metal finish on the outside not sure if I can use the cheap method of stucco like material, I might have to add mesh wire and do some more involved stucco. OSB alone is very low on my list due to water damage and termite and the finish install would need a real breathable layer behind so the OSB can dry once wet. Roof Material: Innova says Uniflex roofing system (painted on) can be applied to Roof as finishing material and save money. Uniflex Rep in my area will not give warranty for Uniflex used on pitched roof (12/4) so I am not sure if that is a good idea. then I have to go with either Shingles or metal roof. Shingles sounds the cheapest option then question is should I go with OSB+ MgO under the shingles or just OSB, the extra layer of MgO is extra cost if not needed. Innova is the only company I found that can do only MgO structurally, then question is .. any issue with nailing shingles to MgO boards? keeping in mind solar will need to install on this ... probably something with 4 feet span to install to rafters attaching the roof SIPS every 4 feet. finally the metal SIPs... I was told I can use the Finish of the steel SIPS as the actual roof finish, maybe a darker paint on top to increase the heat absorption but that will be the roof.. question is if 1) that will be a building code issue 2) any issues with solar install 3) is that a durable roofing material for my area that last 20 years or so? galvanized metal on the roof.. no idea how long that will last in New york. -I have to 1st rule out any material that will not last me 20 years. Then see how that material work with my finishes and calculate the cost of the SIPS and the material to finish them. sorry for being all over the map with this post .. hopefully it makes sense to someone out there. another consideration is if economically worth it to buy the interior walls and floors in SIPs or prefabricated. are the prefabricated metal interior walls cheaper than tradition timber 2x4 (labor and material)?
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04 Aug 2017 04:12 PM
The last part, if it's economically worth buying interior walls in SIP material, has to be a definite no.

If you wanted real stucco on Steel SIPs then yes you need to add the right mesh layers. But there are spray-on finishes like paint that sort of mimic the appearance of stucco (I don't know how well they perform).

Steel SIPs can be used as a finished roof without additional covering, but it depends on the shape of the roof, like a simple gable or lean-to. But more complex roof lines with lots of valleys and shapes cut in would be better with a finished roof, and you can go with any type you want (shingles, metal, etc.). But yes they are durable - it's basically the same material that a standing seam metal roof is made from, coated galvalume.

Are you in a snowy part of New York, or more like the coast?
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04 Aug 2017 05:25 PM
Posted By Jelly on 04 Aug 2017 04:12 PM
The last part, if it's economically worth buying interior walls in SIP material, has to be a definite no.

If you wanted real stucco on Steel SIPs then yes you need to add the right mesh layers. But there are spray-on finishes like paint that sort of mimic the appearance of stucco (I don't know how well they perform).

Steel SIPs can be used as a finished roof without additional covering, but it depends on the shape of the roof, like a simple gable or lean-to. But more complex roof lines with lots of valleys and shapes cut in would be better with a finished roof, and you can go with any type you want (shingles, metal, etc.). But yes they are durable - it's basically the same material that a standing seam metal roof is made from, coated galvalume.

Are you in a snowy part of New York, or more like the coast?


we are in the north part of long island , not too far from the north coast but we do get good amount of snow and rain. My main concern is the quality of the Metal Roof that comes with Steel SIPs. How long can I practically expect them to last? If I can confidently use metal SIPs as roof, I skip the whole roofing expense and use S-5 mounting system for solar. arent the metal SIPs as roof going to be too slippery at slope of 12/4 to walk on safely? not the biggest fan of interior of the house having the metal finish, but thta might be actually a plus in the bathroom/shower wall.
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06 Aug 2017 11:07 AM
A 12/4 pitch is not that steep. The bigger question is shape: it just a gable shape, essentially two planes? Or a shed roof (one plane)? Are there any hips, valleys, dormers?

The interior side of the exterior SIP walls would be finished out like the rest of the interior walls.
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06 Aug 2017 01:56 PM
Posted By Jelly on 06 Aug 2017 11:07 AM
A 12/4 pitch is not that steep. The bigger question is shape: it just a gable shape, essentially two planes? Or a shed roof (one plane)? Are there any hips, valleys, dormers?

The interior side of the exterior SIP walls would be finished out like the rest of the interior walls.


east west gable , one ridge , 2 planes nothing on the way minus a possible plumbing vent and a skylight/hatch access I am concerned over the quality of the metal used in the SIPS comparison to a real metal roof that is claimed to last for decades or lifetime of the house.
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07 Aug 2017 03:16 AM
The steel SIP skins are essentially the same material as you would find in a metal roof, with a similar variety of warranted coatings.
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07 Aug 2017 03:20 AM
Posted By Jelly on 07 Aug 2017 03:16 AM
The steel SIP skins are essentially the same material as you would find in a metal roof, with a similar variety of warranted coatings.


any recommendations on metal SIPS manufacturer?
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07 Aug 2017 03:25 AM
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20 Nov 2017 01:53 AM
Posted By doctorman on 03 Aug 2017 10:22 PM
OSB with MgO on top ..............

OSB+ MgO under the shingles or just OSB, the extra layer of MgO is extra cost if not needed. Innova is the only company I found that can do only MgO structurally, then question is .. any issue with nailing shingles to MgO boards? .................
Seeking clarification.

Did any of the SIP companies say they would put MgO over OSB for you?

Sound like the OSB would be rot sandwich being trapped like that unable to release it's own moisture.

Did Innova say they would do this or just that they would do Mgo structurally?

I recently asked about nailing shingles in another thread, does it hold a nail (read elsewhere they don't) much like cement board from what I can tell, only stronger, and not all crumbly (I hope).

 





George (Architect)
www.kachadoorian.com
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