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Normally i do ok with diy, but...
Bathroom window on first floor hinge is bust and the window doesn't close properly
Its fine most of the time as i want the ventilation, except when there is a stiff wind with a N in the direction
So. Is it essential the length of tge hinge is identical to the previous? Screwfix sell one 20mm shorter or 20mm longer, new screw holes i can cope with.
And. How the hell do you hold the window open and swung out whilst mounting the new hinges. Do i need bar clamps and bungee cords. No, no one is here to help. So i need 3 arms.
I had the same dilemma a few weeks back, in the end got a local locksmith in to do it. He did it from the inside but the trick was to remove the double glazed unit first - which is 90% of the weight. Then it was just easy as you could hold the window with out hand and it could hang on a single screw without bending anything in the new / old hinge.
I can't remember if I had help but I did tie a rope onto the handles because it was in significant danger of being dropped!
Some one who knows what they’re talking about will be a long to advise. In the mean time - If you replace them one at a time then it will be partially supported by the other hinge. Also I’d say you need to do it from the outside. Disclaimer- I’m not a window fitter.
I replaced the friction hinges on 6 windows this summer, it’s pretty easy.
Make sure they are the same length bit longer or shorter is fine), and the stack height (depth) is the same.
You can totally replace them from indoors. Take out the screws on the frame side (it won’t fall) then you can rotate the window and bring it in through the opening.
Remove old hinges, fit new (you may need to drill new holes), then with hinges partially open, pop back through the opening and pop the frame side arms back in place. Screw back in, check alignment, job done. Easy.
YouTube it, plenty of example vids.
I did my second-storey bathroom window from the inside (encumbered by the sink in front of the window, too). It was pretty terrifying - the window was indeed incredibly heavy. I tied a climbing rope around it for safety, but it still felt very precarious.
I'm not sure you can do one side at a time on my windows. Taking the glass out would seem to be a great move if possible.
Yeah I did this a few years back, with Screwfix hinges. needed a drill bit for metal for the new holes and somehow supported the window myself whilst changing them. I remember it's hard work until the first screw is back in.
I think I was able to get part of the pane to balance in the frame somehow and leant it onto my shoulder or head, but local company wanted what I thought was crazy amounts per pane.
My windows were all about 55cm x 80cm. I wouldn't have wanted to do it with anything bigger.
Update.
What a nightmare job. All the screws were rusty and hard to remove or rounded out and needed cross cutting.
I built 2 arms out of old floor boards, notched out to fit over the lower non opening window frame. This held the window whilst i got all the fixings out.
Of course the new hinges are similar, but not identical. Lots of drilling new holes as the frames still had busted screws in them where i had drilled the heads off.
Then i could refit them using the arms as a support. Refused to close fully so out they came, the head of the hinges are longer than the original ones, this mounts the hinge lower, so i had to melt slots into them about 3mm deep to allow the window to sit a tiny bit further out at the top so lets the lower edge in deeper and they now close properly.
My double glazing is old school, with the external beads so poping the glazing back in after fitting is impossible without a long ladder and a head for heights but the floorboard brackets worked a treat.