Another DIY pour success
Last Post 30 Apr 2009 10:39 AM by Mark Fleming. 26 Replies.
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ICFconstructionUser is Offline
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27 Apr 2009 06:08 AM
That lintel bar in the last photo looks very close to the side, do you have enough cover?


Brad Kvanbek - ICFconstruction.net
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27 Apr 2009 08:58 AM
Posted By ICFconstruction on 04/27/2009 6:08 AM
That lintel bar in the last photo looks very close to the side, do you have enough cover?
We always have enough cover as the steel and the concrete connect with the next blocks. From above you don´t even see that there is a lintel.
Working carefully is necessary but it is not a miracle to build solid without having thermal bridges that creates so much heat loss.

Attachment: hannover-30.jpg
Attachment: Stürze all lentgh.jpg

JBACC1103User is Offline
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28 Apr 2009 09:06 PM

Nice Job.

I feel the same about the SIPS, would have cost me about 10k extra, I really wanted to use them, but just couldn't justify the cost.

In the end there are some things that SIPS can't do efficiently when it comes to roofs.



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28 Apr 2009 10:35 PM
JBA......just curious......how are SIPS not good for a roof? I've always read that SIPS make excellent roofs. Alot of angles?


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29 Apr 2009 08:31 PM
Don't get me wrong, I think SIPS are a great thing and for many roofs they work well. There are just some instances where they can't compete.

The roof on my house is similar in design to the roof on Mark's but slightly more complicated. I tried to get some quotes for a SIP roof. The first guy basically told me 'no way' the second guy threw out a number of 60k. The last guy, who I really liked, came in at around 43k but I had to install all sill the plates, plus do the garage with trusses, rent a crane and possibly a lull. At that point I was in the low fifties. It was just too much.

So I went ahead with a regular framed the roof, stick built main house, trusses on the garage 16k materials 12k labor 4k for the lull, which was hi-way robbery, plus another 10k for the open cell foam (yet to be installed) adds up to 42k. For me it was hard to justify the extra ten grand, when you get two very similar performing systems. I know the SIP would be better, but is it that much better?

These days it is all about money. It would really suck to get to the end of this project only to find out I overspent and can't get a decent mortgage or one at all.
 


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robinncUser is Offline
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29 Apr 2009 10:30 PM
That makes alot of sense.......


Mark FlemingUser is Offline
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30 Apr 2009 10:39 AM
I think that the "problem" with SIP roofs is based on a lack of engineering, and the lack of engineering is market driven.  There just isn't enough demand for a SIP company to produce detailed generic tables (like the span tables) for allowable angles, required connections, etc. for the ridges and valleys in a SIP roof. 

A good example was my steep roof with gable dormers.  Kind of a simple design, but the in-house SIP engineering came back specifying GluLam beams on the ridge and valleys.  The SIPs sat on top of 5x24 and 5x14 GL beams on ridges, valleys, and trimmers.  I asked if they could use 2x14 LVLs formed into the SIP edges and just screw them together, making it a monoque roof. 

There are tables showing the screw pattern required to join the LVLs, but there was no engineering to support that application for SIPs and I couldn't find an engineer that would undertake the project given the lack of information available.  I understand what the engineers meant.  It isn't economically feasible to spend $30K in engineering on a $25K roof.  Since in-house SIP engineering might not answer all the questions of a particular design, the engineering remains incomplete.

My framed roof has a single 2x12 LVL down each valley and greatly exceeds the code span requirements.   It "could have been" really overbuilt with SIPs containing integral LVLs, but the industry just isn't there yet.  It may never be.

Mark


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