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Check the survey and goods supplied. Prior to starting any work, the installer should check the following.

  1. Check that the survey sheets are correct and clear.
  2. Check that the windows supplied are those the customer ordered and are undamaged.
  3. Check the glass type and pattern are correct.
  4. Check the window and glass size are compatible.
  5. Check all ancillary profiles and trims are correct

Checking Frame to Opening:

  1. Place frame in the prepared window opening.
  2. Maintain a 3mm gap between sashes and frame for proper window operation.
  3. Plumb and level the window frame using a spirit level.
  4. Use temporary wedges to hold the frame in position.
  5. Adjust wedging for vertical and plumb jambs.
  6. Check diagonal measurements and squareness of head and cill.
  7. Verify stiles are not bowed.
  8. Bed cill on suitable mastic, do not drill through.
technical drawing
technical drawing

Fixing through Frame:

  1. Fix outer frame in two positions, see drawing 1.
  2. Fixing should be between 150mm and 250mm from corners with maximum centres of 600mm, see drawing 2.
  3. Use countersunk head screws for fixing.
  4. Pack frame at screw positions with shims before final tightening
  5. Avoid overtightening to prevent frame distortion, see drawing 3.
  6. Ensure outer frame is not bowed, maintain 3mm gap between sashes and frame, see drawing 4.
  7. Use expanding foam only as a gap filler, not an alternative to mechanical fixings.
  8. Check for frame distortion after fitting, clear debris and drainage paths.
  9. Remove protective tape as soon as reasonably practical.

Installation using fixing brackets.

  1. Attach fixing brackets to stile, head and cill, in accordance with manufacturer’s instructions.
  2. Positioning them at 150-250mm from each corner. For bigger windows, more brackets may be required for bigger windows,
  3. Ensuring that the fixing points do not exceed 600mm apart. Frame fixing brackets are available in the following lengths – 175mm, 200mm, 250mm and 300mm.
  4. Place the frame in the window opening. Maintaining a 3mm clearance gap between the sash’s outside and the frames inside
  5. Plumb and level the frame using a spirit level and wedges.
  6. Drill through the fixing bracket holes and secure the vertical corner brackets.
technical drawing
technical drawing
  1. Check the diagonal measurements of the frame and ensure the head and cill are square.
  2. Use a straight edge to check for any bowing in the stiles.
  3. The cill should be bedded on a suitable mastic.
  4. Before final tightening, pack the frame at screw positions with shims. Avoid overtightening fixing screws to prevent frame distortion.
  5. Ensure the outer frame is not bowed for optimal weather performance and sash operation.
  6. Expanding foam should only be used as a gap filler and not as an alternative to mechanical fixings. Remove debris, contaminants, and clear drainage paths. Remove protective tape as soon as possible to prevent difficulty in removal due to aging.

Although reasonable care has been taken in the compilation of this document, Victorian Sliders do not accept any liability for damage resulting, whether directly or indirectly, from the use of the information provided. Accordingly, this document is supplied on the basis that the user accepts all risks associated with the task in hand.

The procedures in BS 8213-4 2016, Code of Practice for the survey and installation of windows, or any subsequent updates following this document should be followed at all times.

Technical Planning
uPVC Technical Documents

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What do our customers say?

Victorian sliders are very professional…

Victorian sliders are very professional and really nice people. I highly recommend this company. Good quality and excellent service.


16 August 2023


Great customer service from a knowledgeable account manager!

We have been buying sash windows from Victorian sliders for just over a year now - the windows are really well made and great value . Gracie has been our...
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08 August 2023


Sales Team Stars!

The sales team are always more than helpful with setting up our orders and answering the million and one questions us and our clients have. We love having Maddy as...
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10 August 2023


Sash windows

Whenever we need sash windows we always use Victorian sliders , their product is great and the service is good. We usually deal with one person for our area which...
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14 August 2023



We've used Victorian sliders for several years! Gracie is our account manager and I can honestly say she is amazing, so attentive to our needs as a company. always quick...
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11 August 2023


Great experience on a large complicated order

It was a large order of 38 sash windows, The complete order went extremely smoothly from quotation through to signing of which was double checked before processing, Charlotte who dealt...
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08 August 2023


Highly Recommend

I regularly order from Victorian Sliders for my company, They are always very helpful and efficient, the quality of the product is very good and our end customers are always...
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14 August 2023


Superb Sales team

Have used Victorian Sliders for around 3 years now and Gracie in the sales team has been amazing! She is always helpful and keeps me up to date with the...
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01 July 2023


Helpful & polite

The staff members are always very helpful and polite, and very efficient and professional when dealing with my orders or any questions I need answering regarding their product. They have...
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08 August 2023


Nationwide Distribution throughout Ireland & the UK

We have 6 depots spread across Ireland & the UK, meaning we can offer a reliable delivery service to tradespeople nationwide. In addition to our West Wales HQ, our Irish operations are based in Tullow, Co. Carlow. From here, we deliver to locations across the Republic of Ireland, from Dublin to Cork and Galway to Limerick.

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Unit 72, Grayshill Road
Westfield North Industrial Estate
North Lanarkshire
G68 9HQ

Scottish Depot

Tel: 057 862 9544



Unit 6, 21 Westway
Chesford Grange

Warrington Depot

Tel: 057 862 9544



Cambridge House
Cambridge Road
CM20 2EQ

Harlow Office

Tel: 057 862 9544



Unit 2 Tullow Business Park
Rathoe Road
Co Carlow
R93 N349

Victorian Sliders Showroom

Tel: 057 862 9544


Head Office (South Wales)

Victorian Sliders
Victorian House
Parc Hendre, Capel Hendre
SA18 3FA

Arial shot of factory

Tel: 057 862 9544



Unit 4, Red Lodge Business Park
Warleys Lane
West Wick
BS24 7TN

Victorian Sliders WSM Sales Hub

Tel: 057 862 9544