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The law since 1984 means that both the builder and the owner are responsible for Building regs. The builder carrying out the work can be prosecuted up 2 years after the completion of works. For the home owner an enforcement notice can be sent up to 12 months, unless they go to the High Court...

There is a difference between the finished article. A pure air lime, such as lime putty, or hydrated lime when fully cured will be more flexible and breathable than a hydraulic lime. The disadvantages of pure lime are that one: it takes much longer to harden up and needs damping down and...

Hydraulic lime was around in the 30's. It was either made by adding a pozzolan to lime putty, or the Lias lump lime (hot lime) that was delivered on site produced a hydraulic lime. With lime mortar, a sharp sand can be used because unlike cement mortar it's still a workable mix.

@danlightbulb Question 1 There's 2 main types of lime. Air, or non hydraulic lime and hydraulic lime. Air limes set by absorbing carbon dioxide only. Lime putty and hydrated lime are examples. Hydraulic lines set by a combination of absorbing carbon dioxide and hydration. When people say lime...

I can understand you having a problem with the various advice around. I'll give you a more detailed answer to your questions when I get home.

I didn't answer your original question, because firstly I didn't see it, and secondly I don't answer every question on here. PD6678 2005 is a good source of information for mortars in the UK, but you'll have to pay for it unless you have access to the Construction information service. Unless you...

Your understanding of the subject is wrong. If adding hydrated lime to a cement mortar mix only worked to make the mix more workable it wouldn't be a specified mix on certain jobs. Plasticizers are much cheaper and easier to use, so hydrated lime wouldn't be used if there was no benefit to it...

The use of lime in a mortar mix for repointing isn't totally about it's workability. The mortar is more flexible, and has self healing properties for minor cracks. It's also more breathable. The cost is greater for using lime mortar however, so for general building nowadays the slight benefits...

The 30's was a time when a lot of builders were still using lime mortar, but gauging small amounts of cement into the mix to speed up the setting. Mortar using only sand and cement is difficult to work with, unless plasticizer or lime is added. You could ask him to use something like a 6/1/1...

Some 9 inch walls are built in Stretcher bond.

They usually come in one piece with a scoreline, so you need to cut them if needed.

That used to happen a lot in the good old days, when the foreman used give one of the labourers a club hammer and chisel and get them to chase out the walls. On some of the older brick walls built in lime, they used to virtually demolish the wall. I've had to rebuild a few when some of the...

There are Building regs for the depth of a wall chase. For horizontal runs it's 1/6th of the walls thickness.

I've seen those photos on another forum said to be Mine rot. I wouldn't know the difference myself.

I'm still on Book one, so can't really help yet. I've heard that @^woody^ has finished Book three, so he's the man to ask.

Must be an old book using double headed nails. Looks like an old one from W.G.Nash.

Try and push some against the sides of the brick in the perps with the pointing trowel first to build it up at bit at the back. Then leave it to harden up while you do the rest and fill in later.

There is no set time. Houses on the seafront often have the joints taken out in 30 years or less. Sheltered walls with really tight joints might still be full 100 years later.

That's the way it's done in the USA. When trussed rafters started being used here they didn't realise the problem with racking without the boards. Early roofs didn't have the diagonal bracing.

Rooms that heat up quicker often cool down quicker. For example a room with insulated plasterboard will heat up quicker than one with thick stone walls and external insulation. However, once heated, the stone wall becomes a heat store.