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Using a complete repair system which includes specialist tools, highly trained operatives and the most advanced resins, Kierson can achieve durable, cost effective repairs.

                                                        Sash window repairs. How to replace a mid rail.

     Rotten sash window before restoration             Fully restored sash window

We carry out repairs using the most advanced resins on the market.......

                                                                Rotten woodwork repaired with resins 
                                                     Rotten timberwork repaired with resins

which means we can work on large areas in one go........

                                          Rotten timber repaired using resin in Sheffield

we can also work on more awkward shapes........

           rotten timber mouldings repaired with resin     rotten and damaged corbels restored with resin   rotten columns and plinths repaired with resin 

And for best value we incorporate the traditional method of splicing timber into large repairs using the resin to bed in and seal around the new wood........

                                     Timber splicing combined with resin repairs

This is particularly good for replacement sills, making them in effect, watertight........

     Rotten sills removed and replaced with new hardwood  New hardwood sills bedded on using resin

Rotten window bottom is removed   new timber sill and resin recreates the original window

The Alternative to Linseed Putty

To prevent water penetration at the glazing line and as the final piece of the whole repair system we offer an alternative to linseed putty. This is a rubberised, elastic glazing compound that in effect seals the wood to the glass and remains flexible and adhesive long after traditional linseed putty has gone brittle and fallen out.

                              Linseed oil putty is not the best option for glazing lines


FAQ and Answers             There are currently 17 questions in this section
Q1   Why are my windows so rotten?
A     Windows rot and decay when the wood becomes wet. This is usually caused by the break down of the paint, it cracks and allows moisture to penetrate which dries, causes the paint to flake and lift and exposes more wood and so the cycle carries on. Prevent this from happening by having a good paint cycle, anywhere between 3 and 8 years for windows in good repair. (see Main Menu section on 'Painting and Decorating'). 
      Moisture also penetrates where the putty has broken down. Putty becomes hard and brittle over time then cracks allowing moisture to penetrate and sit in the glazing line. Once it has become brittle it can fall out altogether (see above section on 'The Alternative to Linseed Putty').

Q2  Why should I repair my windows, can't I just replace them?
A    There are lots of reasons from aesthetic to financial, from ecological to your property value as to why you should repair your windows and not replace them.
     A lot of the time we survey windows that have been condemned unnecessarily. In our experience only a small percentage of the actual window is in need of repair, usually where water becomes trapped or sits as shown in grey below;

                  Rotten areas on a sash window

       It has been independently assessed that we can generally repair a window for around 25% the cost of replacement.
       Planning Permission is not required for repairs but please consult your planning department if you are in any doubt or if your building is listed and/or qualifies for a grant (see Q4 and Q5).
       The repairs are all done in situ so there is no need for any brick work.
       Because the windows remain in the building security is not compromised.
       By keeping your original windows you are maintaining the integrity and character of your property. Even if you install new timber windows you will be changing the glass. Original sash windows have what's known as 'Crown Glass' which is very distinctive and can only be replicated at great cost. You may not have noticed the appearance of your glass, but you will once you change it! (see Main Menu section on 'Glazing').
       Environmental issues should play a big part in your decision. Replacing your windows with uPVC is a whole new argument (see Q6). However, also consider the waste caused by the replacing your windows with new timber windows;- removal of your old windows, what hapens to fill, burning..? Then there are the implications of the environmental impact of the whole manufacturing usage, where is the wood sourced from..?
       The value of your property is greatly enhanced by the retention of period features. Whilst uPVC is a definite no-no and timber windows are preferred, the greatest value is put on 'original' windows.
       We can overhaul your windows to such a degree that their overall performance is greatly improved (see Main Menu section on 'Draughtproofing').

Q3   But you specialise in repairing windows, how do I know that it wouldn't make better economic sense to replace my windows?
A     Ask us! We specialise in repairs but we also manufacturer new timber windows. We like to see original windows repaired but we also like to give our customers 'Best Value', if we think it will be more cost efffective to replace your windows we'll tell you! (see Main Menu section on 'Replacement Windows'). 

Too much waste makes Sven an unhappy boy........          Timber windows are thrown away unnecessarily

 Q4    Do I need Planning Permission or Planning Consent for you to carry out the repairs?
 A      No, generally Planning Permission is not required for repair work. However if you have a Listed Property, you live in a Conservation Area or your property qualifies for a grant then we recommend you double check with your council and/or Conservation Officer.

 Q5   My property is Grade II Listed, do I need to inform the local Conservation Officer that you are carrying out repairs?
 A     If you have a Listed Property, you live in a Conservation Area or your property qualifies for a grant then we recommend you double check with your council and/or Conservation Officer before we start work. We are happy to work alongside Planning Departments and Conservation Officers.

 Q6    If I replaced my windows with uPVC then I wouldn't have to maintain them would I?
 A      The arguments against uPVC are far ranging, aesthetic and environmental (see Q2) but the argument for them was that they were maintenance free, you may notice that now they tend to be billed as low maintenance. Like any window they get dirty and need to be washed but after time they can either fade so you never get that just cleaned look or worse, they can go grey or even yellow, so even though they are supposed to be maintenance free you'll now see paint for uPVC and we get back to the initial argument of not having to paint your timber windows.
          If uPVC cracks or is forced it's hard to repair and even harder to conceal the repair.
          We are now replacing uPVC windows with new timber windows (see Main Menu section on 'Replacement Windows') because they are breaking down. You can expect a good uPVC window to last upto 15 years but how long have your timber windows been in your house? We are also replacing uPVC windows with new timber windows where property has been sold and timber is preferred by the new owners.

 Q7    What if I need to change the fasteners or put new furniture on the windows you have repaired with resin?
 A      Once the resin has cured which is usually complete in 24 hours you can treat the repairs as you would normal timber. It can be sanded, planed, nailed and screwed to.

   Top quality resins can be drilled and screwed like timber              quality resin can be planed like wood

 Q8    Will I be able to paint/stain over the resin repairs?
 A      Yes, once the resin has cured, usually within 24 hours, you can treat the repaired areas as you would normal wood (see Q7). Prior to painting it should be sanded, following all the usual health and safety guidelines for sanding wood, this blends the repair seemlessly to the existing timber and provides a key for the coatings (see Main Menu section on 'Painting and Decorating').

 Q9    I have a casement window that's in good condition but all my other windows have small 'georgian style' panes of glass. Can you match them up?
 A       Yes, in the same way that we repair windows we can add in glazing bars to existing frames (see Main Menu section on 'Glazing' where there is an example).

 Q10  My windows are hard to use, they get stuck when I try to open and close them, can you alter them?
 A      Yes, during repairs we can alter and adjust the way the window runs. You could also have the windows draughtproofed which makes them slide more easily (see Main Menu section on 'Draughtproofing). We can also fix a range of furniture to your windows such as handles and lifts that are replicas of original furniture designed to make using sash windows easier (see Main Menu section on "Hardware").

 Q11  My windows are draughty, they rattle and I get dust blowing through them from the road, can you fix that?
 A     Our draught proofing service is what you need (see Main Menu section on 'Draughtproofing'). 

 Q12  I live on a main road and I get a lot of noise, is there anything that can be done to stop this?
 A     Yes, draughtproofing does greatly reduce road noise (see Main Menu section on 'Draughtproofing'). 
        Also we are able to install 'acoustic glass' in some windows (see Main Menu section on 'Glazing'). 
        Secondary double glazing is an option but can restrict the use of your sash windows (see Main Menu section on 'Glazing'). 

 Q13  I've got old 'crown glass' /stained glass /etched glass in my old rotten windows. Can you repair around that?
 A      Yes, the routing tools we use work at such a rpm that the glass is unaffected even if it is touched. All our operatives work with care and diligence but this old glass is very delicate and usually very thin and we can not be sure of the stresses already placed on it (see Main Menu section on 'Glazing'). 

 Q14  I've got crown glass /stained glass etched glass that's cracked, can you replace it when you repair the windows?
 A      Yes, often we can source original glass to replace broken or damaged pieces, otherwise we can have it manufactured for you (see Main Menu section on 'Glazing').

 Q15  I've got original fasteners on some of my windows but not on all of them. Can you match them up ?
 A      Yes, there is a huge range of reproduction hardware on the market now and we can fit that for you. Sometimes we are able to source original fittings for you too. The other alternative is that we are able to have any piece of hardware made by hand so even the strangest pattern can be matched. (see Main Menu section on 'Hardware'). 

 Q16  I love my original sash windows but I also like modern touches. Is there anyway I can put a new twist on my windows?
 A      Yes, in many cases sash windows were painted so that the boxes and the sashes were 2 different colours, of course your windows can be painted internally to match any decor (see Main Menu section on 'Painting and Decorating'). 
        An easy solution is to change the hardware which can always be changed back later if required. Many of the original fastenings and fittings are now reproduced and come in a variety of finishes. Changing your fittings to chrome can give a clean, contemporary feel.(see Main Menu section on 'Hardware'). 

Q17  Will repairing cause any internal decoration damage?
A      As far as internal decoration is concerned we always work as conscientously as we can. Occasionally, removing a rotten sill for example, that goes through to the inside of the window can upset plasterwork. Normally it is a simple job to rectfiy this. Of course, taking off internal sash beads can damage paintwork but this is usually only minimal and in most cases can just be touched in. However we can not accept responsilibilty for damage to paintwork and/or wallpaper. We strongly recommend that you have your windows repaired prior to any internal decoration works. We do offer a full painting and decorating service. (see Main Menu section on 'Painting and Decorating) We also offer a minor building works service (see Main Menu section on 'Other Services').