Green Building Bible, Fourth Edition |
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: djhSo we fitted our front door last Friday, which means the house can be closed overnight. Now I see condensation on the inside of all the locks and the inside door handles. Granted the humidity is pretty high because the plaster is still drying out so I can ventilate and heat a bit more and that will probably largely stop the condensation. But it does illustrate that both the lock and the handles are metal cold bridges through the door. Are there any ways to avoid the problem (though it may be too late for me)?Had the same problem. Be warned though, if they are the 'euro' style locks give them loads of WD40. I had 2 fail because the humidity meant they got damp inside and rusted solid!
Posted By: DarylPPerhaps some plastic/composite structure might be better?
Posted By: alexctry someone like trotech for a cheap dehumidifierMake sure it's the new dessicant type, not the old compressor type. Dessicant types maintains efficiency in UK conditions; compressor types only work well in sub tropical hi temp hi humidity conditions.
Posted By: djhIndeed. I was hoping to find that somebody knew of such a thing. But I suppose the part is put under quite a lot of stress.
Posted By: djhGraphite is not recommended for use with cylinders, and oil should NEVER be used."They sell little aerosol cans of "lock oil" here for the job. Not sure how different it is from WD40.
Posted By: Chris P BaconThere are some which have a physical tag which you hold against the lock to open it. Seems like a step better but no doubt they can be intercepted and copied in some way too.If they can then they're inexcusably badly engineered. There was a time when car remotes could be intercepted (and they were - there was a black market in little boxes to listen to people locking their cars and to produce the appropriate code to unlock) but now they use cryptographic techniques to stop that.
Posted By: GreenfishI have been thinking about a seasonal handle insulation fitting - pipe insukation plus... - especially on the French door that doesn't get used much in winter. Cover the outside taps, why not handles too?
Posted By: Ed DaviesPosted By: Chris P BaconThere are some which have a physical tag which you hold against the lock to open it. Seems like a step better but no doubt they can be intercepted and copied in some way too.If they can then they're inexcusably badly engineered. There was a time when car remotes could be intercepted (and they were - there was a black market in little boxes to listen to people locking their cars and to produce the appropriate code to unlock) but now they use cryptographic techniques to stop that.
I have to admit I'm not clear how they work - they use a long cycle of codes and when one has been used it's blocked off for a while to prevent replay attacks. What I don't understand is how that works with multiple fobs and lack of, AFAIK, two-way communication.
A house entry system with some sort of two-way NFC should be easy to make secure with public-key cryptography. E.g., the house generates a long random number, passes it to the fob which encrypts it with its private key and sends the encrypted text back. The house then decodes it with the fob's public key, checks it's got the right number and unlocks the door.
Bear in mind, also, that physical keys can be copied remotely. Take some nice high-resolution photographs with a long lens of somebody taking the key out of their pocket then process the image and 3D print or cut the key. It's been done at the proof-of-concept level publicly; whether it's been done black-hat is but harder to say, of course.
Posted By: HollyBushI thought this was why many people have curtains at the back of the door, or a porch.
Alternatively remove the square spindle thing and the catch - just use the bolt and key to lock it - the handles can be fixed handles then. (Just remember to remove the catch :-) )
Posted By: Ed DaviesThere was a time when car remotes could be intercepted (and they were - there was a black market in little boxes to listen to people locking their cars and to produce the appropriate code to unlock) but now they use cryptographic techniques to stop that.
A house entry system with some sort of two-way NFC should be easy to make secure with public-key cryptography. E.g., the house generates a long random number, passes it to the fob which encrypts it with its private key and sends the encrypted text back. The house then decodes it with the fob's public key, checks it's got the right number and unlocks the door.
Bear in mind, also, that physical keys can be copied remotely. Take some nice high-resolution photographs with a long lens of somebody taking the key out of their pocket then process the image and 3D print or cut the key. It's been done at the proof-of-concept level publicly; whether it's been done black-hat is but harder to say, of course.