add window (repair) page

technical/windows.md

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+# Windows
+
+Most Kanthaus windows are from the DDR: these are basically old-school, wood-frame-and-glass windows, but doubled. You can seperate them by carefully unscrewing the two slit-screws facing inwards on the frame.
+
+## DDR window repair
+### Glass replacement
+- **replacement glass:** Wagner Fenster @ Jacobsplatz are nice and might have some old windows you can negotiate for. Transport glass in frame, much less likely to break. Otherwise Baumarkt? Our windows our surprisingly large: see the Dorm window for how to make do with smaller bit of glass.
+- **clear frame:** Knock out old glass, scrape away old kit and nails so you have bare, clean wood all the way around. Use gloves and be careful!
+- **cutting glass:** We have a glass cutter and instructions in the workshop, in a small plastic container, on the shelf above the screws. Please read the instructions thoroughly and ensure you can reliably make a long, straight cut before trying on your final piece! Glass should be ~2mm smaller than frame on every side. 
+- **fit glass:** carefully place cut glass in empty frame. Fix roughly in place with window nails: there is a bag of them in the white 'goo' cupboard at the bottom, at the back. Push them in using a spatula using only horizontal force. One every 10-15cm.
+- **grout glass:**
+    - traditional: get a bag of fenster kit, warm it up. Using a spatula, grout it in as a 45 degree wedge (see any other window). The window can now be remounted. The kit should be painted over after ~1 week, once the kit has developed a 'skin', with linseed oil paint. Paint should go over and onto the window glass and frame ~2mm — the paint acts as an oxygen barrier, keeping the kit flexible and long-lasting.
+    - modern: use silicone gun and nylon wedges. Shouldn't need painting... but please use white silicone :)