Glazing Frames

[bootsam]

I note from the glazing construction that the frame resistance does not alter whether one uses pvc, steel or whatever from the drop box. Thus I am asking what the drop box does? Plus anyone have a list of the typical resistances for wood, pvc, aluminium theyd care to share. Thanks.

[PCully]

Hi,

Not quite sure how it is used by the user guide says the Frame Type input is only used in UK Part L Compliance testing so that at least gives an explanation why it didn't affect the calculated resistance value

Type: The type of frame material selected from a list. The list includes softwood, hardwood, steel, aluminium, PVC and metal and this is used in UK Part L compliance testing.

Phil

[PCully]

update: the Frame type is used for SAP calcs it seems

[bootsam]

Thanks. My issue with it is that the glass U Value is centre pane. However the overall uses the resistance to calculate the overall window u value. Thus a list of the resistances would be useful. For instance if i use pilkington suncool 50/25, they quote centre pane as 1.0 W/m2.k. However we all know that the actual window will likely be around 1.4W/m2.k overall or greater. Thus i nudge the resistance of the frame to achieve this whilst keeping the centre pane value constant. But to be honest i'd like to know the actual resistance and i am damned if i can find them anywhere I will keep looking but maybe i need to find my old materials engineering handbook from my loft.

[PCully]

There must be some resources out there if it's not a value manufacturers can provide?

I had a quick look at the Apache tables doc as this can be a useful reference for much of the VE thermal work but it only gives a section on typical window u-values with/without frames so not quite what you needed this time.

Phil