Internorm KS430 sliding door seals question

[Mr Blobby]

I'm in the process of compiling a long list of issues for my internorm installers.  Widnows are fine, but the fitters were appalling.

 

I can't decide if the internal seals between glazing and frame on the slider is going to make the list and require some help please.

 

The sliding door seals are fine.  Very neat, very tight, very uniform.  In sharp contrast the seals on the fixed section look, well, rubbish.  The fixed section seals are a much softer rubber, all bumpy and judging by the condensation, not thermally terrific.

 

Here is the seal I mean, sorry about the picture, but it is very hard to capture the problem in a photo:

 

 

I am concerned that the seal may have been substituted, it is a bit crap compared to the other seals. 

 

Can someone with an internorm KS430 please put me out of my misery. Please check your door and tell me, are the internal glazing seals on the sliding section completely different to the seals on the fixed section?

 

Thanks....

Edited Monday at 22:21 by Mr Blobby

[Nickfromwales]

Did they glaze these on site?

[craig]

Without seeing in person, it sounds like they may be been stretched slightly and then shrunk causing the issue you see in picture.

 

Is it the root cause of condensation? Hard to say as @Nickfromwales said, were these built on site? 

[Nestor]

We have HS330, triple glazed timber / aluminium lift sliding door.

A lot of timber in the doors and no condensation except outside on certain days.

No problem with the fixed seals.

Not an expert but would say fitting error.

Like you the fitters and some parts of manufacturers were poor quality. Disappointing.

Add to the list.

 

[mike2016]

KS430 lift and slide here - the fixed section seals pictured below:

My seal seems thinner to yours but is smoother. 

Sliding section seals are identical:

[Mr Blobby]

On 05/01/2026 at 22:42, Nickfromwales said:

Did they glaze these on site?

 

Yes, I think the fixed section only hence the isssue.  

 

On 05/01/2026 at 23:45, craig said:

Without seeing in person, it sounds like they may be been stretched slightly and then shrunk causing the issue you see in picture.

 

Is it the root cause of condensation? Hard to say as @Nickfromwales said, were these built on site? 

 

Currently being plasterd so humidity is in the 90s hence the condensation, but there is more on the fixed pane that was glazed on site.  For reference, all five of the other windows that were glazed on site have broken or porrly fitted trims with air coming through the holes in the trims on at least three of the windows.  So glazing on site was rubbish.  The fitters also left behind as box of internorm fix-o-round sealant that internorm supply to be applied round the glazing units.  The missing sealant is probably why the air is coming trough the broken trims, around the glaxzing units.  I did ask the fitters about the sealant at the time and they poo-poowd me, saying it isnt necessary.  That isnt what internorm would say though, so they will be refitting all the glazing with the sealant applied.  Although the box I have on site is out of date now.

 

 

On 06/01/2026 at 14:01, mike2016 said:

KS430 lift and slide here - the fixed section seals pictured below:

My seal seems thinner to yours but is smoother. 

Sliding section seals are identical:

 

Thank you for this.  So, your seals are the same on both fixed and slider section? That is very useful information.

 

I'm compiling my list today.   

Edited 15 hours ago by Mr Blobby

[Nickfromwales]

11 hours ago, Mr Blobby said:

I'm compiling my list today.   

Go get 'em, tiger!!!!!!!