Makeitstop

Accepted

Soz about looking at floor and not the wall. I'll go back to the corner

Ive been stood there like a naughty boy looking at the floor until the next post came up to gain my attention. Thanks Nick. My legs were starting to ache a bit.

Like an utter moron, i forgot to make clear that the 2g solar glazed v 3g std glazed part of this question relates to the rooflight only. The slider and window are going to be 2g only. They have been leaning towards 2g opening Velux rooflight with solar glass, but i feel a standard triple glazed unit offers more for the same cost. If the room gets hot during summer, and to some extent due to solar gain, they can open the roof window to allow warmer air out. The benefit of 3g during winter is surely a real advantage, as it has better ability to trap any rising warm air generated by UFH within the room. To my thinking, 2g with solar control glass is moot if you can vent the bloody heat out.

My view on any significant solar gain, is that it's going to be happening in the warmer months, when the external temp is elevated also. This is where the electrically operated opener comes into its own, as the warmer air is going to travel up into the ceiling void where the rooflight is positioned. If that is opened up, it allows that warmer air to escape. If it were a fixed rooflight, then the need for control of any gain is more crucial yes?

The question relates to the rooflight only guys.

Part of a job my daughter and son in law have underway is posing an either or type discussion..... This is..... The rear of the property is being extended and will be approx 70..ish sq metres once complete. The aspect is pretty much dead west facing, so plenty of sun. The glazed elements of this rear section are.... Slider of approx 4 metres by 2.4 metres Single pane t&t window of approx 1.8 metres high by a metre wide. Velux Rooflight of approx 2.5 metres long by 1 metre wide, split into two sections, one half fixed and other half electrically operated opener, fitted into small section of flatroof. Now, given the fact that this is west facing, which means a fair solar gain, would people choose 2g with solar glass, or 3g with standard glass? I ask, as the prices come in about the same for each. To me anyhow, this is how they stack up.... Benefits of 2g and solar glass 1) less solar gain. Thats about it from what I can come up with. Benefits of 3g std glass 1) Less noise during heavy rain 2) Better ability to trap in warm air that rises within the room during colder weather 3) Lower risk of condensation Given the fact that this rooflight has the ability to open during hot summer weather too, which allows warm air out, how much benefit does solar glass provide in reality? Both will have some affect on light transmission I know, but I've not looked into what the "actual" diff is. At the same cost, what would you pick and why? Am I missing anything obvious here?

Ah well

It would be maybe 3.5 metres total width, perhaps 4 metres max. Height approx 2.7 maybe

7 metres?

As above. Sorry, not really researched this as yet. It was a discussion i had recently. Question relates to a project my daughter has coming up, which is a sizeable job. She seems to think PVC can do this, but to my mind (and poor memory) its too large. Its been a few years since i did my own job, where i used Reynaers slider. Anyone have views on this?

Thanks for the input guys. Interesting range of view Seems ally clad timber is the apparent choice if cash has recently rained a foot thick into our gardens. I see pvc features too, and that doesn't surprise me. Having read a bit of late, it would seem that pure aluminium isn't what many would lean towards. Questions around poor frame values seems to come up a lot when aluminium framed products are discussed, and I cant say that surprises me. From my own experience of doing a rear extension and fitting of Raynaers products, the level of condensation is simply unacceptable. Yes, it may well be in part due to install, and also, somewhat due to it being a kitchen with an occasionally elevated relative humidity to what might be the ideal, but, from past experience with pvc framed products, never have I noticed condensation as bad. It's massively frustrating. My question was simply to gauge what the good folks on BH thought to it, as I have been discussing this subject with son in law, in relation to an upcoming major rear extension to a late Edwardian house. Budget is a constraint (as it often is) but a sound choice is essential I think. My advice has been....... give pure aluminium a miss.

Thanks all. Blimey Mike, 1st choice there would hurt the pockets. Why never pvc? Steamy... never heard of grp in window frames, is it used? What would you choose? Nod, yes I get that re: your own selection. Ally is so expensive, and I'm not sure what the real world advantage is when sizes can be Don in alternative materials. What did you use and are you happy with it?

Jimbob, will you share what product you are referring to? No need to name business or company that supplied or fitted, just the product. No worries if not.

Hi all. OK, so the question above is aimed at frame material for windows / doors, and, whether any future choice would be wood, pvc or aluminium framed products, whether they be double, triple or whatever glazing. This is obviously for products of the kind of dimension that all materials could handle, so no 20ft high mega sliders or suchlike. Thoughts, and why?