ICF How much more expensive ?

[BotusBuild]

On 03/03/2025 at 08:41, Russell griffiths said:

the only reason I see the need for reinforcement of a basic straight short wall would be if it was holding back a load, like a semi basement, or any roof load pushing outwards onto it. 

What we had to do for ground floor because it was going to be a retaining wall part way round (horizontal and vertical). But the SE insisted on extending the horizontal rebar through the top floor as well

[Nick Laslett]

5 hours ago, Iceverge said:

Are those metal webs the same as the ones @Jenki has?

No, not really. Polysteel Block
 

 

Thermohouse block

 

 

The Thermohouse block flanges/webs are 40mm wide, spaced at 150mm centres.

[Iceverge]

Are those flanges strong enough to take a reasonable load like a big TV?

[Nickfromwales]

5 hours ago, Iceverge said:

Are those flanges strong enough to take a reasonable load like a big TV?

Easily! You can also rebate the insulation to fit plywood across multiples of them if you were looking to affix between or away from the flanges (where the fixing holes simply don't line up for eg). Exp foam behind the plywood and then fix that to the flanges, leave to cure for 24hrs, then crack on with plaster boarding. Much more flexibility if you make the plywood patch a lot bigger, so when the rooms finished and you think the TV's too high / low etc you have room to manoeuvre  

[Nick Laslett]

5 hours ago, Iceverge said:

Are those flanges strong enough to take a reasonable load like a big TV?

 

I'm not sure. They don't have any technical specs for the flanges. For internal finishing, you can either batten to the flanges, then fit plasterboard, or glue and screw the plasterboard directly to the blocks. When I finish the build, I might test the holding strength of the flange, but I would have thought it can hold 15kg on a single screw. The Fischer EPS fixings I use have a 10kg rating and they are just held in the eps.

 

 

 

 

Edited Tuesday at 16:57 by Nick Laslett

[Nickfromwales]

16 minutes ago, Nickfromwales said:

Easily!

Obvs should have caveated by saying don’t hang an 80” TV off one fixing lol. 
 

200mm concrete screw for anything crazy. Happy days. 

[Nick Laslett]

I've watched a fews of these Youtube testing videos, and it is surprisingly how much weight plasterboard can take. (Obviously there are many different specs of plasterboard.)

 

This one tests a number of different fixings.

 

https://youtu.be/nfGG1Z5m-5A?si=tu70HP6OMuasUncK

 

DIYGuy Table

 

 

Gosforth Handyman has a load of testing videos, and he compared the Fisher Duo fixing in plasterboard and got good results, 27.8kg

 

Just as a point of reference the Samsung 98” Neo QLED 4K QN90D TV weighs 61.4kg. The Samsung 65” OLED S95D 4K TV weighs 18.9kg. TVs are just not that heavy these days. My old 60" Pioneer Kuro Plasma weighed 55.5kg.

Edited Tuesday at 17:20 by Nick Laslett

[Chanmenie]

With my Beco blocks the inner insulation is only 55mm so for heavy stuff like radiators, TV and the doors I cut the insulation and bolted  4x2 timber to the concrete core, that gave a good base for fixing stuff 😀

 

this was for the TV Bracket, I took photos so I could remember where they were after I’d plasterboarded over them 

 

[SteamyTea]

With any fixing, it is not just static loads you need to consider.

Jerk is important.

[Iceverge]

1 hour ago, Nickfromwales said:

Obvs should have caveated by saying don’t hang an 80” TV off one fixing lol. 
 

200mm concrete screw for anything crazy. Happy days. 

 

 

BUT

 

I'M

 

LAZY..........

[Nickfromwales]

1 hour ago, Iceverge said:

 

 

BUT

 

I'M

 

LAZY..........

God dam-nit. 
 

Have you been speaking to my wife?

[ToughButterCup]

15 hours ago, SteamyTea said:

....

Jerk is important.

 

Oh how many times did that have to happen before someone enlightened me about shock-load? Hundreds.

 

From hand-held hammer drivers to dumping heavy objects on shelves, or being catapulted out of a mini-digger seat, or tapping a 'locked' nut, or opening a tight jam jar.