Rockwool 0.032W/m.K batts....coming soon apparently

[Thorfun]

visited my local BM trade fair this morning and was chatting to the Rockwool rep and when I told him I went glass wool as Rockwool didn't do a 0.032W/m.K batt (0.035W/m.K is the best they currently offer) he said that it was in development and should be available in about 6 months.

 

obviously, salesmen can't always be trusted but at least they're working on the product to give an alternative for those of us that want that little better U-value.

 

I did tell him it was too late for us though but he gave me a free beanie hat so I went away happy. 🙂

 

[SteamyTea]

1 hour ago, Thorfun said:

Rockwool didn't do a 0.032W/m.K batt (0.035W/m.K

Is that really enough of a difference.

0.02W.m^-2.K^-1 on a 150mm of insulation.

That is lost in noise and fitting errors.

[ProDave]

23 minutes ago, SteamyTea said:

Is that really enough of a difference.

0.02W.m^-2.K^-1 on a 150mm of insulation.

That is lost in noise and fitting errors.

I make in 0.003 m^-2.K^-1 better

 

But on a .032 m^-2.K^-1  product, that is an improvement of about 9% so more than you might think.

[saveasteading]

22 minutes ago, SteamyTea said:

That is lost in noise and fitting errors.

But the same logic apples to any product.

 

But if that really is for batts, not rolls, then I reckon they are fitted with fewer errors, as they have to stack closely or they go out of module and create more work,,,so are done properly . usually.

And 0.03 / 0.035 is an improvement of 9%  which to me is good in any product. 

[SteamyTea]

9% per metre, not at 150mm.

But my mental arithmetic may be wrong as doing something else at moment.

 

R = 0.15 (m) / 0.035 (k)

R = 4.286

U = 1 / 4.286

U = 0.233

 

R = 0.15 (m) / 0.032 (k)

R = 4.288

U = 1 / 4.288

U = 0.233

 

Is that right?

 

 

[BotusBuild]

m^-2 is "per metre square", not per metre of depth? If I'm right, then the 9% improvement is irrelevant of how thick the slabs are

[saveasteading]

I would like 9% improvement in product or efficiency any time.

That makes the whole project 9% cheaper, right?. 

[saveasteading]

27 minutes ago, SteamyTea said:

R = 0.15 (m) / 0.032 (k)

R = 4.288

U = 1 / 4.288

U = 0.233

Faulty calculator there   R=4.68  U = 0.21

 

.21/.23  =  0.91

[SteamyTea]

18 minutes ago, saveasteading said:

Faulty calculator there   R=4.68  U = 0.21

 

.21/.23  =  0.91

That is where it is then. But eyesight, or fat fingers.