Aluminium or concrete cills

[jayc89]

8 minutes ago, Russdl said:

@jayc89 that will all depend on how high above the window the gutter is.

 

In our situation the window in the main bedroom is on the side wall, gable end and no gutter. When it’s chucking it down the big drips hitting the metal cill is like a drum. 

When it happens I generally move out to the spare room where the gutter is just above the window head and the problem is almost non existent. 

 

That's useful to know, thanks. We have a hipped roof, so guttering all around and reasonably long eaves, so I'm taking that we'd be lower risk of getting that noise?

[Iceverge]

Thermally concrete is tricker but it's cheap and uber durable.

 

We have 600mm overhang of our hip roof including gutters.

 

The only time the upstairs bedroom windows get wet is when there's a howling wind to join the rain. 

 

[jayc89]

20 minutes ago, Iceverge said:

Thermally concrete is tricker but it's cheap and uber durable.

 

We have 600mm overhang of our hip roof including gutters.

 

The only time the upstairs bedroom windows get wet is when there's a howling wind to join the rain. 

 

 

I say reasonably long eaves, they're nearly half yours at 350mm! (They look much longer, unless the elevation drawings I have are wrong!) The sill would be nearly 2300mm below the gutter. 

[shuff27]

10 hours ago, jayc89 said:

 

That's useful to know, thanks. We have a hipped roof, so guttering all around and reasonably long eaves, so I'm taking that we'd be lower risk of getting that noise?

 

We have alu cills with our Norrsken windows - the only noisy ones when raining are the small GF windows in the gable end; the FF windows in the same gable (including the one in our bedroom) are not affected, presumably they get enough protection from the roof eaves.

[craig]

11 hours ago, Russdl said:

When it’s chucking it down the big drips hitting the metal cill is like a drum. 

You can get anti drumming with them to minimise that.

[Conor]

No noise from our aluminium sills - one is 3m long and water landing on it from two stories above. And they are deeper than standard due to the extra 100mm EWI. They do seem to splash back on to the glass, not sure if that's specific to aluminium but certainly more than I've noticed on other buildings with concrete sills.

 

They are really, thick, heavy sills laid on a full bed of foam / EPS.

[Russdl]

50 minutes ago, craig said:

You can get anti drumming with them to minimise that.

I shall look into that. Thanks. 

[craig]

A quick google https://www.mepa-shop.de/en/window-sills/aluminum-window-sill-accessories/anti-drumming-strips-for-window-sills/anti-drumming-strips-for-window-sills

[Mr Punter]

17 minutes ago, craig said:

A quick google https://www.mepa-shop.de/en/window-sills/aluminum-window-sill-accessories/anti-drumming-strips-for-window-sills/anti-drumming-strips-for-window-sills

 

Hi Craig

 

Do they stick to the underside of the ali sill or fit on the bottom of the opening?  Also, are they available in UK?

[craig]

Underneath, example from Gutmann cills.

 

[G and J]

On 23/01/2023 at 08:43, Conor said:

No noise from our aluminium sills - one is 3m long and water landing on it from two stories above. And they are deeper than standard due to the extra 100mm EWI. They do seem to splash back on to the glass, not sure if that's specific to aluminium but certainly more than I've noticed on other buildings with concrete sills.

 

They are really, thick, heavy sills laid on a full bed of foam / EPS.

@Conor May I ask what company/product you’ve used?  
 

We’ve just started the search for an aluminium windows/doors suppliers and hadn’t thought to check the construction of the cills.  We are building timber frame with both vertical wood cladding and render on the outside.  

[Conor]

1 hour ago, G and J said:

@Conor May I ask what company/product you’ve used?  
 

We’ve just started the search for an aluminium windows/doors suppliers and hadn’t thought to check the construction of the cills.  We are building timber frame with both vertical wood cladding and render on the outside.  

windows are internorm, the sills were sourced by our window supplier, I think it's a company based in Dublin but I've no details as never dealt with them directly

[G and J]

12 minutes ago, Conor said:

windows are internorm, the sills were sourced by our window supplier, I think it's a company based in Dublin but I've no details as never dealt with them directly

Oh I see.  Thank you for that.  I assumed (probably because we’ve always done it that way) that the cills were integral to the window.  I’m guessing that the cills are sealed to the window in some way to prevent water getting in between the two.  Is that correct?

[Conor]

1 hour ago, G and J said:

Oh I see.  Thank you for that.  I assumed (probably because we’ve always done it that way) that the cills were integral to the window.  I’m guessing that the cills are sealed to the window in some way to prevent water getting in between the two.  Is that correct?

Yes, simple lip.on the back of the sill fits up and behind the bottom of the frame. Then all.sealed up.

[Gone West]

7 hours ago, G and J said:

We’ve just started the search for an aluminium windows/doors suppliers and hadn’t thought to check the construction of the cills.

We used Trueline Products to fabricate the aluminium sills, to our dimensions, for our windows. Trueline powder coated them to match the windows. It was a long time ago but I assume they still do it.