1. Introduction
2. Timber
3. Quality Control
4. Care and Decoration
5. Operating Instructions
6. Summary

Clift Joinery Maintenance Guidance for Supply Only Services

Window and Door Delivery, Storage, Installation, Maintenance and Warranty Delivery of Windows and Doors
Wherever possible all windows and doors will be delivered in single units. Larger windows and doors may be delivered with sashes/doors supplied separately for fitting on site by the customer.

Where required, frames may be delivered in kit form for assembly on site – the customer must be responsible for specifying that frames are required in kit form. 
All surface mounted furniture will be pre-fitted but may be supplied separately if damage in handling or installation maybe likely.


All windows will be delivered to a point on a safe hard road surface nearest to the delivery address. 
The customer is responsible for suppling the necessary labour or mechanical handling to unload and store the products in a safe and correct manner.

Checking Your Delivery

It is your responsibility to check the delivery to ensure that products are in good condition and sign off the products as matching to your order and in good condition. This will not affect warranties. If there are any issues, please contact us immediately.

Storing Your Windows

Windows should be stored in a clean and dry area where they will not be damaged.
Please do not store windows:

  • In excessive sunlight or heat
  • In complete darkness (as this may cause the paint to discolour)
  • Laid flat on painted surfaces.
  • If windows are stored for more than 2 months all packaging must be removed.
  • All packaging must be removed prior to installation.
  • In areas of high humidity i.e. recently plastered room.

Fitting Your Windows and Doors

The following is a brief guide to installing Clift Joinery products. This information is not a definitive instruction it is for advice only, it is based on long term experience and good practice. Clift Joinery takes no responsibility for any issues caused by following this advice.

General Installation Advice

  • Wherever possible windows will come with sashes/doors pre-hung and ready to fit into an opening.
  • Windows/doors are heavy and it is likely that two people (maybe more) will be needed to lift them into position.
  • Windows and doors should be fitted into pre-existing openings and not built in.
  • Windows should be fitted by someone experienced in the installation of traditional windows and doors.
  • Opening should be approximately 10-15mm larger than the window required, this enables a simple fit and allows for a good external weather seal either with a silicone seal or cement filet externally.
  • Use a DPM under the cill and up the sides of the window and door by 300mm.
  • Do not use the window frame as a rest for a scaffold pole or for access without protection.
  • Please note use of excessive amounts of foam may deflect the window frames.
  • When fitting Accoya products only stainless steel screws and fixings must be used externally or in areas internally with high moisture, e.g. bathrooms. When fitting surface mounted internal ironmongery where not exposed to moisture, non stainless fixings are acceptable.
  • If the paint finish is damaged in any way thereby exposing the timber, proper repairs must be undertaken, exposed areas must be end sealed and touched up with primer undercoat and top coat.

Fitting Sash Windows

  • Traditional windows should be fitted with counter opposing, folding timber wedges evenly spaced around the box frame.
  • Once fixed in place and square, fill the void behind the box frame with expanding foam. Take care not to use too much foam, as this may cause deflection in the frame.
  • Do not use any form of mechanical fixing or screw through the hollow box section.
  • Seal carefully externally with a mastic point or with traditional cement pointing.

Large Sash Windows

  • Heavier sash windows will come with sashes supplied separately and will need to be hung once the frames are correctly fitted.
  • Sash Weights will be corded and left in the box, all staff and parting beads will be pre-cut and ready for fitting.
  • Sashes are hung by simply passing the sash cord through a hole and knotting it off, no specialist tools are required.
  • Spring balances will be supplied with the window for fitting by a competent person on site.

Fitting Casement Windows and Doors

  • Windows should be packed/wedged evenly within the existing opening.
  • It is important to ensure that frames are fitted absolutely square and level within the opening, as distortion may prevent doors or casements opening or closing properly.
  • Either fix on stainless steel straps or screw through the frame and packing points directly into the brickwork using a Fischer fixing or similar in stainless steel.
  • Fixings on the jambs should be close to the hinge points often underneath the hinges. For larger windows fix at the head and cill.
  • Screw holes must be plugged, filled (with a quality two part filler) and touched up after fitting.

Large Windows

  • Windows/doors over 2.5m2 will come with sashes/doors supplied separately and will need to be hung once the frames are correctly fitted.
  • Hinges will be pre-cut and should not need adjustment – if it seems adjustment is required, please check the frame is fitted squarely.
  • Doors/casements will be marked as for their openings.

Fixing Items to Windows

If items are to be fixed to window frames such as shutters, then care must be taken. Accoya is very durable however they do have a low moisture content and are quite brittle, damage to the timber might occur if incorrect or inappropriate fixing is carried out.

Some important rules:

  • Never fix to or through a hollow box frame
  • Always pilot holes before screwing into the timber.

If you have any questions please call for advice.

Damp Unventilated Environments

Windows must not be fitted in recently plastered rooms or in enclosed rooms where moisture content is very high. A wet internal unventilated environment may well damage paint surface or cause movement in the timber. Installation of windows into these environments without prior consultation may invalidate the warranty.

Protecting Windows that have been Fitted

It is essential that windows are protected at all times from site damage. This includes wet trades, dust, dirt and pollutants. 
Glass, paint finish, weather seals and hardware may be damaged if windows are exposed to these hazards.  Windows must be treated with care. Fitted windows and doors should be fully covered once fitted

Cleaning Windows

If windows need to be cleaned following installation or a build project, please clean with a mild detergent and use a minimum amount of water. Wipe off any excess water post cleaning. Never use a hose or pressure washer on your windows or doors.


Clift Joinery has a very experienced fitting department, if you have any issues or questions during installation or need further advice, please call us.

Clift Joinery Window and Door Maintenance Guidelines

It is essential that you read this guide carefully and afterwards adhere to the standards set down. If you do not understand any of the contents then please call us for advice, we will be delighted to help you. Please note that if you fail to adhere to these standards any product warranty we offer may be at risk.

If you follow the guidelines and give the windows/doors the correct care and attention, products will give you extended life between maintenance cycles.


Once fitted, if on a building site, windows and doors must be protected and treated properly. You should treat your windows as you would treat furniture in your home.

Paint Finish

The paint finish is of primary importance and must be looked after, please be sure to do the following:

  • Clean the paint finish at regular (annual) intervals with a mild detergent.
  • Make sure the paint finish does not get damaged by abrasion or chemical agents.
  • Carry out regular inspections for any minor surface damage and carry out touch ups as necessary.

Maintain and repaint the windows/doors in line with the following schedule:


SHELTERED e.g. under a porch
Climate- Moderate: 
Non coastal low altitude
Clift Joinery standard – 6 Years
Dark colours – 5 Years
Stains – 5 Years

Climate- Harsh: Exposed areas inland
Clift Joinery standard – 4 Years
Dark colours – 3 Years
Stains – 4 Years

Sheltered e.g. under a porch
Climate- Extreme: 
High altitude, Coastal
Clift Joinery standard – 3 Years
Dark colours – 2 Years
Stains – 3 Years


PART SHELTERED e.g. in a brick reveal
Climate- Moderate: 
Non coastal low altitude
Clift Joinery standard – 4 Years
Dark colours – 3 Years
Stains – 5 Years

Climate- Harsh: Exposed areas inland
Clift Joinery standard – 6 Years
Dark colours – 3 Years
Stains – 4 Years

Sheltered e.g. under a porch
Climate- Extreme: 
High altitude, Coastal
Clift Joinery standard – 5 Years
Dark colours – 3 Years
Stains – 4 Years


EXPOSED e.g. on the building façade
Climate- Moderate: 
Non coastal low altitude
Clift Joinery standard – 3 Years
Dark colours – 3 Years
Stains – 3 Years

Climate- Harsh: Exposed areas inland
Clift Joinery standard – 4 Years
Dark colours – 2 Years
Stains – 3 Years

Sheltered e.g. under a porch
Climate- Extreme: 
High altitude, Coastal
Clift Joinery standard – 3 Years
Dark colours – 2 Years
Stains – 2 Years

Dark Colours

Products painted in dark colours will normally require more frequent maintenance as paint will be damaged by the sun and the temperature on the surface of the paint/window will increase. This can sometimes lead to blistering paint and the opening up of window joints.

The time between coats of dark coloured windows will be extended by good maintenance.

How to Carry Out Paint Repairs if Paint Finish Gets Damaged

If the timber is exposed:

  • Scrape or sand around affected area, seal with end grain sealer and fill with a quality two part filler as required.
  • Sand down after filling
  • The affected area should be given a prime, undercoat and topcoat allowing paint to dry properly between the coats. 
If mitres have opened up or there are shakes (small splits) in the timber:
  • Fill the gaps with a good quality paintable acrylic sealant and apply three coats as above.

For cosmetic repairs:

  • Gently sand affected area
  • Apply topcoats as required to bring back the paint finish 
If there is extensive damage to the paint coating then windows may have to be fully sanded back and redecorated. 
Please be sure to apply any paint in line with the manufacturer’s recommendations with regard to temperature and humidity and make sure that the surface is clean before application.

Double Glazed Units

Clift Joinery are the London agents for Slimlite double glazed units and glaze them in house. They are made to the highest standards and carefully quality checked.
Re glazing should only be required if the unit is broken. If this happens please contact us, we will quote either for re glazing on site or a complete replacement sash. 
In the event of a sealed unit failure i.e. misting up, please contact us and we will arrange replacement under warranty.

Slimlite Double Glazing (Edinburgh Limited) or any Heritage units

It is recommended that timber windows should be painted every five years for Inland areas and three years for Coastal areas. To avoid any water getting behind the putty a 2mm overlap from the putty line must be painted on to the glass.  However, it is recommended that the paint protection of the glazing including the overlap on to the glass face, should be repainted every three years to maintain the required protection particularly with putty fronting. Ultra Violet has a detrimental effect on most paints, particularly on south facing elevations.  However more frequent ‘spot painting’ may be necessary to maintain the required standard of protection.

General Window Maintenance

Check the weather sealing around the exterior of the frame to ensure a good seal.  Weather seals should be cleaned and any dead insects removed.

All hinges, handles, trickle vents and working parts should be checked annually and lubricated as required with silicone spray or light oil.

If you require any further advice with regard to the maintenance of the windows, please contact us.