Air tight circular window

moldy_sea

Has anyone any tips on how to get a circular window that's air tight casement with pivot opening point?

I've spoken to a few joiners and they advise they are notorious for leaking.

Are other materials able to achieve better results?

Dudda

What is the room and do you actually need it to open? If you've other windows in the room which open I'd ask yourself if you really need it to open. We had an issue where we were told one window was to large to open without sub dividing it. The solution was to have it a large fixed piece of glass as others in the room opened. Best decision ever as it looks great.

kadman

You would need to chose a wood that has the least amount of movement
during expansion and contraction due to environment.

Plus a design that allows for minimum movement.
And the proper gaskets/seals that complement the design and timber choice.

What size is the window

kadman

PVC circular windows would be the best as regards sealing.

Is this an option for you.?

moldy_sea

kadman wrote: »

You would need to chose a wood that has the least amount of movement
during expansion and contraction due to environment.

Plus a design that allows for minimum movement.
And the proper gaskets/seals that complement the design and timber choice.

What size is the window

outer diameter 900mm

moldy_sea

kadman wrote: »

PVC circular windows would be the best as regards sealing.

Is this an option for you.?

asked a populare company but they only do with a mullion across the centre

moldy_sea

Dudda wrote: »

What is the room and do you actually need it to open? If you've other windows in the room which open I'd ask yourself if you really need it to open. We had an issue where we were told one window was to large to open without sub dividing it. The solution was to have it a large fixed piece of glass as others in the room opened. Best decision ever as it looks great.

Unfortunately needs to be an opener

kadman

Is it a standard opening or pivot opening.

Does it have to be wood, or is pvc or another material an option,
Single, double, or triple glazed .
There is always a solution here.

Depending on construction details, whether its layered or spliced, there has to be a solution.
Joinery company insisted on a mullion because their method of construction is spliced , or a complete
circular frame from jointed boards. The mullion holds the frame from becoming elliptical.

Some methods of construction would not need this.

So what materials can/cannot be used ?

kadman

Stable method of constructing a bullseye window.

moldy_sea

kadman wrote: »

Is it a standard opening or pivot opening.

Does it have to be wood, or is pvc or another material an option,
Single, double, or triple glazed .
There is always a solution here.

Depending on construction details, whether its layered or spliced, there has to be a solution.
Joinery company insisted on a mullion because their method of construction is spliced , or a complete
circular frame from jointed boards. The mullion holds the frame from becoming elliptical.

Some methods of construction would not need this.

So what materials can/cannot be used ?

Any material is ok. Pivot opening. No mullion. Which material would give best results for sealing for air tightness?

moldy_sea

kadman wrote: »

PVC circular windows would be the best as regards sealing.

Is this an option for you.?

I've only found PVC option with mullion. Do you know anyone who could do one without?

Lumen

Alu?

Random search result...

https://www.absltd.co.uk/aluminium-round-windows/

kadman

Both aluminum and pvc would give a better result than timber.

Gaskets and sealing would be more or less equal in both. As modern gaskets
are sometimes interchangeable between both systems.

Aluminum sections can sometimes discolour where fitting screws are used on window furniture
in older systems, but I suspect newer systems do not have this issue.

Modern materials would definitely give a good result from an airtightness point of view.
And proper gasket fitting around the pivot hinge needs to be well maintained yearly, to ensure
no leaks.
Gaskets suffer from shrinkage due to heat, thats why older window systems leak. Its easy and
an inexpensive thing to replace the gaskets if they do leak.

Have a closer look at aluminium and pvc, and see which gives the better guarantee going forward.