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Everything you need to know before buying Windows, Doors or a Conservatory

How to measure a PVC Window

When you measure an opening you must take three measurements and should be taken across the opening, along with the squareness of the aperture by taking measurements across the diagonals. The smallest measurement of determine the manufacturing size.

The need for any sub-cill (85mm) should be determined. The size of the sub-cill overhang should be such that it is an overhang of at least 25mm from the face of the brickwork to the inner edge of the cill overhang. The surveyor will determine the method of fixing, check requirements for cill horns and how any making good is to be carried out

  •   The difference between the internal and external reveal sizes should be determined and checks made to the operation of the opening light to ensure it is not impeded by plaster, render or tiles etc.

 

Deduction from width and height from brick openings

 

Up to 1.5m

from 1.5m to 3m

from 3m to 4.5m

over 4.5m

GRP

5

10

15

15

PVC - White

10

10

15

20

PVC - Non White

15

15

22

28

Hard / Soft Wood

10

10

10

15

Crital / Steel

8

10

12

15

Aluminium

10

10

15

20

  •   Deductions are from the TOTAL width and height not per side
  •   The gap required for effective polyurethane foam fixing at the head is 10 - 15mm
  •   When the width of height exceeds 3 meters intermediate expansion joints may required

 

 

How to Measure a PVC Windows

Ever wonder how the professionals measure a PVC Window or Door?

7th May 2010

The new Document L has been approved and will become law as from the 1st October 2010. This requires any windows installed in residential properties to be C rated or better or a U-value no worse than 1.6 W/m2k.  For more information check out the New Document L1A

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