Marmox ThermoBlocks, are they worth the investment? Would they work on our build?

[Stoph43]

Hello Gang, we looking to get your thought / advice or any experience from anyone who has used Marmox Thermoblocks.

 

- Where building a simple timber frame 2 story new build - Frame delivery is in a few months 140mm wall with an additional 100mm PIR inside, on concrete slab with 150mm PIR on top followed by screen

- We're just finishing excavating the strip foundations and about to order the concrete. Cross section of the foundations below

 

 

 

- Is it worth us adding a layer of Thermoblocks in between the 2 x 140mm block courses? (shown in RED arrow) Would they benefit in our situation?

 

Would be great to hear your thoughts, 

 

Thanks

[JohnMo]

Can you add an attachment - not sure what you have added but it doesn't open.

 

I found the gains weren't worth the cost. I used thermolite blocks, with engineered bricks on top to attach stud walls. 

[Alan Ambrose]

I don't think there's an alternative when you need to (a) support a load and (b) maintain a reasonable thermal barrier. Most good thermal insulators won't support much of a load unless it's spread across a large surface area.

[Alan Ambrose]

p.s. the link gives this:

 

[Post and beam]

If i knew before i started what i now know about the detailing required to meet the requirements i would have used Marmox everywhere.  Heres why....

 

Our SIPs build requires 60mm PIR upstands around the outer walls and 25mm PIR for the internal walls. The inner walls were a nightmare to accomodate and not cause issues with them sticking proud of the plasterboard. All told the time required to measure cut and fit all of these upstands is/was a total pain in the backside. Time i could ill afford. 

Only when i finished did i discover that Marmox under the sole plate makes this unnecessary. It would have been worth the cost to have used them.

[JohnMo]

24 minutes ago, Alan Ambrose said:

don't think there's an alternative when you need to (a) support a load and (b) maintain a reasonable thermal barrier.

There is

 

This my strip foundation structural drawings. We fine tuned it a little, for internal walls. Inverting the engineering brick on top of thermolite.