SIPS v ICF - is Phase shift really a factor?

[saveasteading]

1 hour ago, sgt_woulds said:

 there is no spare capacity to add PV panels,

I had missed this, now obvious,  option!

 

Sedum is very heavy so out of the question.

But PV? 

It's likely this could work. If you were to ask an SE to look into it they might find a bit of spare capacity.  Specifying joists is simply choosing the next size up that takes the load, so there is usually some spare.

Then they might consider the gantry spanning between structural walls, not all bearing on the roof.

OR  joists will have little capacity at midspan but more near to  the supports... fix there.

If the task is to make this specific thing work, then they can look at several options, review other loadings more critically, and even take an overview if it is not quite there.

First find a lightweight PV system.

 

 

 

[sgt_woulds]

I'm an ex PV specifier / installer and roofer, so I'm aware of my options... none of which will provide significant shade for my roof unfortunately. 😞 

 

But enough distraction from the OP - hopefully we convinced not to use SIPs, but I wouldn't go for CIF either!

 

I've felt guilty enough about the amount of global warming my house will have contributed to with SIPs, there is no way we should be building monolithic concrete structures in this day and age. 

 

What are the percieved advantages of CIF that would push Mueller to use this method?

 

 

[Muellar]

1 hour ago, sgt_woulds said:

I'm an ex PV specifier / installer and roofer, so I'm aware of my options... none of which will provide significant shade for my roof unfortunately. 😞 

 

But enough distraction from the OP - hopefully we convinced not to use SIPs, but I wouldn't go for CIF either!

 

I've felt guilty enough about the amount of global warming my house will have contributed to with SIPs, there is no way we should be building monolithic concrete structures in this day and age. 

 

What are the percieved advantages of CIF that would push Mueller to use this method?

 

 

Perceived advantages 😉 are in part due to me liking solid things and the feel you get from that, too many bad experiences of new build TF and studwork/squeaky floors, then our site is exposed as that way we get the views we'll have out over Lough Neagh, so I know we'll get hammered by the wind as I grew up in that area. To keep within planning ridge height without having a sprawling footprint we also made use of the fall of the land so have a partial basement - making one part 2 floors with only 1 appear above external ground level.

 

I'm also a 'believer' in thermal buffering/mass as well so the whole thing stacked up to me for using ICF and I liked the idea of a thinner EPS layer inside than outside. I've always felt that cavity/brick-block has had it's day so that wasn't on my list of desired building forms.

 

We will clad the whole thing partially in metal including the roof, standing seam either zinc or greencoat plx and the rest in charred timber, so in part what's behind those doesn't really matter.

 

And yes... this whole discussion and the points you are all providing are swaying me back to ICF - although I get that you @sgt_woulds would see another method as being better than ICF. I'm guessing due to the carbon load of concrete from your comments?

[saveasteading]

2 hours ago, sgt_woulds said:

I'm an ex PV specifier / installer and roofer, so I'm aware of my options... none of which will provide significant shade for my roof unfortunately. 😞 

 

But enough distraction

 No please: more distraction.

This has got my attention and your experience is wanted. 

Self evidently, a PV panel will prevent some ( a lot of) solar energy from reaching the roof. Not only is it shade but also the energy is being taken away as electricity.

Can you explain why it would be insufficient, in your circumstances of on principle?

[saveasteading]

33 minutes ago, Muellar said:

guessing due to the carbon load of concrete from your comments?

I can see the attraction of icf and I costed out a couple of buildings this way, at design concept/tender stage. It wasn't right for my business and these were both private houses,  but I can see the attraction for a self build dwelling.

 

My biggest concern is buukding end of life*. I have a horrible image of the building being scrunched by a concrete crusher and eps being mixed with the rubble or flying off in the wind. Then the crushed concrete being laid as hardcore full of eps.

 

One could redo any "carbon load" with this shown as waste or contamination, to get a different solution.

 

Or perhaps and I hope,  this has been thought through and resolved already.

 

* this can be much sooner than the design life due to land use changes.