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Not equally. When my car fogs up inside, I see no sign of condensation outside. Condensation will occur outside on cold surfaces when air saturated with moisture meets a colder surface but it needs the right weather conditions. I haven’t seen that since winter. Inside a house, the occupants will...

The biggest cause is the occupants breathing and cold walls. You only have to see how quickly an unventilated car fogs up in winter when someone is inside.

Thanks all. To mark out the footing I will use a line and square, plus a straight 2.4 m long piece of timber. The brickwork has to be more precise, so I’ll do it in stages, I’m in no hurry.

Damn! I could level it using my ball head tripod but that’s too complex. There are also laser squares with built in spirit levels, but visibility would be poor to useless.

Ah okay, I should have been clearer, I need to mark out two lines at right angles, preferably 10 by 6 feet long.

I want to mark out footings, and a rectangular two brick high wall, for a greenhouse. The bricks need to be laid accurately. I wondered about using a laser level, and from the looks of things ones on Amazon provide better value than Screwfix et al. I have loads of rechargeable AA batteries. I...

It’s a good idea, square planed timber is a similar price, and the piece I picked up has a flat edge.

The brick wall will act as a raised bed with a path in the middle level with the top of the wall, so no need to step over it.

Yours has the steel base which adds rigidity, mine doesn’t, I could get one, but it costs £120 i.e. the same as concrete plus mixer hire . And then there’s the cost of paving stones. My garden is sloping, about a 4” drop over 10 feet, so concrete will let me get a level, okay not really...

Humidity naturally increases when people are inside for many hours a day. The damp then condenses on cold walls. Wet laundry and bathrooms make it worse.

Thanks. I will hire a mixer. I bought a 2.4 meter length of planed wood and surprisingly it was flat along one side. Unfortunately I cannot get longer pieces in the car. I need the wall to be square to a few mm ! This will be fun … Very kind of Woody to offer. Tea and biscuits will be...

Damp due to condensation often forms behind an object such as a TV because the airflow is reduced, and it may be cooler.

I had black mould in a couple of places inside the house, always a top corner, always an outside wall. One wall was damp. I also had condensation at the base of each window in the morning. If you spend time in your house, the air inside will get saturated, and may condense on cold walls. Perhaps...

I have ordered a Halls Popular greenhouse 10 by 6 foot. I will place it on a low brick wall, two bricks high, supported by a 6” deep concrete footing, on what is currently lawn. My neighbour did likewise 20 years ago, and it’s fine. A problem is that it will be alongside a thick concrete path...

Thanks. I forgot that I store untreated wood in the unheated garage, and that has less ventilation than the loft, and it is fine.

I’ve put down a second layer of Knauf roll insulation in the loft, and I’m insulating the loft door. On the top side of the loft door I’ve built a frame around the edge from an untreated 34 mm by 18 mm pine slat. Is this okay as is, or does it have to be treated? I have some acrylic sealant...

Thanks. The unit has arrived, and the fitting between the motor and the filter is not the same, so I will replace the whole unit.

My front loading Bosch Exxcel washing machine dryer (Bosch wvd24520gb/08) is giving a drain error (F18). The drain filter is not blocked. The outlet looks okay. So I guess it is a failed drain pump. I have bought one of these and it arrives today...

I've worked out why lemmings throw themselves off cliffs. They've spent months reading the DIYNOT General Discussion forum. It is a merciful release.

It's hard to know what to say in response to your posts which are nuttier than fresh squirrel poop. Something tells me you do not work in image analysis.