Replacing a 'sick' Double-glazed Window with another Recuperated Window

Our house, a vernacular longère was never meant to have glass windows and as it had rarely been lived in during the hundred years before we bought it, that aspect had hardly changed. When we came to think about glazing, we decided use the vast amount of discarded windows available. Luckily there was so much raw material, we found a near match for just about every opening. Below is the raw state of our sitting room (middle of photograph), just a few years after the sheep vacated it. As if to add insult to injury and coincidentally a few months before we came out to start living in our house permanently and begin the renovations, hurricane Lothar hit.

Our ruined ruin

Nowadays, we tend to forget and thus to appreciate the value of glass windows, which is probably why people are so ready to replace perfectly good ones and dump them. In past centuries, even the nobility could afford only one set of such precious materials and would ferry them between homes as they moved from Town to Country and back again. The farm where Sue was born had one big picture window bricked up to a tiny 'porthole', due to Window Tax, a stark reminder that even daylight can be subject to payment.

Introduction

There is a previous post which covers the recuperation of old windows, where and how to find them - it can be found here

In this post I am going to start with the first of my three window projects for this Autumn, the easiest one, replacing an existent recuperated window (above left). 

We luckily recuperated a pair of these double-glazed units some ten years ago and I made a frame for and fitted one of them into our sitting room. In the past few months this window has began to look foggy or 'sick' as the seal between the two layers of glass had started to deteriorate.

 

 

Method

All double-glazed windows have a frame with an elaborate profile to ensure a watertight, draught proof joint. 

The frame for the window was made using softwood (pine) and if I remember correctly was cut from floor joist wood left over from when we put floors in this part of the house. The wood selected was as thick as the window. On completion the outside face of the window rested against a rebate cut into the frame. The interior face of the window had a 'lip' 10mm thick on 3 edges (top, bottom and latch) which butted against the frame. The lip extended 10mm from the window edge thus, the interior height of the window was 20mm more than the exterior height. The fourth (hinge) edge of the window was not originally cut square but was cut at an angle (inset above).  I could not hope to achieve this when making the frame, so, after removing the hinges, I cut out the angle and made this edge the same as the top and bottom and made the frame to match. 

The profile on the latch side of the window (the one opposite the hinges) was slightly more elaborate in that it had a stepped profile to accommodate the latch mechanism and a rubber seal running the full window height. This meant that in forming this part of the frame I had to make two additional cuts with the circular saw to produce the matching profile.

Throughout the the life of this window I have never detected any draught so consider the fit was more than adequate.  

Thus with the replacement, after the overall dimensions were found to match the old unit, the hinges were removed. In the following photographs you can see the steps I took to cut the edge square using a circular saw.  

The desired cut was 10mm less than the full depth of the wood so as to ultimately furnish a lip that would match those on the other three sides of the window. 

In my workshop I do not have a saw table but I do have an excellent circular saw. So, whenever possible, I do not use the guide on the saw but use a clamped straight edge against which the baseplate of the saw can slide. In the case of the window I also lacked a surface upon which the saw could move. So, to furnish this I screwed a flat piece of chipboard (recuperated from a pallet top) to the uppermost (inside) face of the window. It is to this surface that I screwed the straight edge to act as the saw guide (below). The second and equally important point about using the chipboard is that prudent packing beneath it brought its upper-face level with the stool (the projecting profile that sheds rain water onto the sill) so that the depth of the saw cut remained constant. You can see the packing in the picture above and below (I used 10mm thick pieces of cladding wood).

NOTE
When I unscrewed the hinges I had two screws that sheared off in the frame, these I then had to drill out so as not to damage the circular saw blade, maybe I should have put a few drops of release oil on the screws prior to trying to get them out.

It is crucial to set the saw depth to produce the lip the same as on the other sides.

 

In making the second cut to produce the lip, the guide and chipboard were unscrewed and the window placed on the floor, held vertically by clamping one end between the jaws of a 'Workmate'.

I clamped a flat piece of timber along the window edge to provide additional support for the saw so as to help maintain the 90º cut along the length. The depth of the cut was set so as to intersect the bottom of the first cut.

Once the cut had been made I was left with the desired square cut edge except that the lip produced was slightly too long, This lip length was important as this is the where the hinges are mounted. 

Laying the window back onto the workbench I screwed the straight edge to the uppermost face so as to guide the saw in its third and final cut.

The existing window was hung on screw-in barrel type hinges and as they were in a perfect condition, I intended to use them again. I obviously had not removed the one half of the hinges from the window-frame so I needed to remove the other half from the old window and screw them into pre-drilled holes in the replacement. 

To ensure the holes were drilled vertically into the edge (of the lip), I rested the window on a pallet which was made to be parallel to the workbench top, the window resting against the leg of the workbench. I used a try-square to check that the window was at right angles to the workbench top and used wood packing between the window and leg to achieve this. Once all was checked OK for being square I drilled pilot holes at the pre-marked positions using the small drill press on the top of the workbench,  thus ensuring the hole was square going into the 10mm thick lip of the window. 

I next opened up the holes by drilling once again but with a larger bit, the pilot holes ensuring the bit did not ‘wander’.

When I had finished drilling, I tried the window in place to ensure the fit was good.

Once done, I could remove it and insert the hinges. The hinges had an M6 thread and I have found with exotic hard woods that by running the matching tap into the holes it makes it much easier to screw the hinges in.

What was then required was to lift the new window onto the hinge counterparts in the window frame, again some adjustment was necessary to ensure exact alignment with each hinge. This can be the most time-consuming part of the operation as it may require the screwing in or out of each hinge until the precise alignment is obtained. 

 

 
When the window was satisfactorily mounted. I could check that it still fitted in the frame, some slight sanding was required and that the closing mechanism also engaged with the existing holes in the frame.

Et Voilà! - a new window!

Now if you'd like to, sit back and watch the film:



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All the best, Andy

© Andy Colley 2014

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Windows for Free Part 1 - Recuperating glass windows and how we used them to glaze our entire house.

When we decided to renovate our house here in France we chose to recuperate as much material as possible. This because it would be in keeping with both our philosophy and the building; there was such a huge and freely available supply and we were working to a budget.  In particular, when looking at glazing we needed quite a volume for the provision of interior light, which was in low supply due to thick walls and few openings.

 

Introduction

Our house is over 300 years old and is a vernacular longère so it was never intended to have glass windows. Each of these Celtic long houses follow the same architectural pattern, in having adjacent, alternate human and livestock accommodation, so these openings were meant either to give light to the cooking area or air to the animals/birds. At night these were closed with wooden shutters and on cold Winter days with sacking. 

As someone had, many years before, lived in one of the human habitations, now our kitchen, we actually had one window, this dating from around the 1930s. So when we came to the question of windows and doors, we just decided to ask at the local joiner’s, where we had already observed the rows of discarded items, some thirty to forty of them, piling up in his car park.

On enquiring with the proprietor we discovered that the windows were waiting to be dumped or burnt. The majority of his business was in making and fitting double-glazed units  and those in the yard were the ones he had removed from the houses prior to installation. The proprietor was so happy that we wanted to take some away for our own use, his means of disposal being to take them to the tip (for which he would pay a fee) or he would have to take them into a nearby field  and burn them! So we loaded the car up with our chosen windows and over the course of  the next few months collected several dozen units, the majority of which were exotic wood and double-glazed. Additionally, I encouraged neighbours and friends with projects of house restoration and greenhouse construction to visit this company and furnish themselves with the valuable free resource, one completed project being the verandah-style greenhouse (read more)

One thing I should make clear with these windows, is that  most of them were in perfect condition, some of the French windows even having keys - apparently many people just wanted to change to UPVC! As expected, very few windows had any frames as these were broken in their removal. 

Some supplies of windows and doors we obtained as they were being removed, these, often from nearby towns were elegant old windows with hand-made glass and fine astragals. 

For people of our philosophy the opportunity of recuperating these windows and constructing a (softwood) frame to fit them was and is a perfect way of using ‘waste’. Furthermore once the proprietor of the company realised what we needed, he and his men not only tried to carefully retain the frames, handles and keys but also kept a look out for specific sizes and shapes of window and doors!

As mentioned above, another way we got windows was to watch for old houses in the area being refurbished. This way we directly approached the building firms as they were loading the windows up to dump or burn. We were able to obtain some really elegant windows this way, many of which we used for our glass greenhouse (read more).

The one and only drawback of recuperated double glazed units

There is however, a problem with old double-glazed units, like the ones we used in our sitting room. Unfortunately, last year we noticed that one of the windows was beginning to get  ‘foggy’ and by the summer of this year it was apparent that it must be changed. By a stroke of good fortune I had recuperated this window with several others from the same contract and in our stable where we store the pallet wood planks I unearthed the twin of the now translucent window. 

In the next blog post I will be sharing how to prepare and fit a recuperated window into an existing frame but in the meanwhile here is a film showing our recuperated windows in use in our house and garden.

Thanks for dropping by and please feel free to share this article, comment, ask questions and if you'd like to be assured of getting the next post, then sign up to follow this blog.

All the best, Andy

© Andy Colley 2014

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