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Thank you all for the replies. I don't know the make of the blocks, I will find out. I have asked the builder to use the solid concrete blocks rather than ashlite or thermalite due to hearing stories of heavy objects falling off such as kitchen units. The current insulation the builder is...

Hi, As I understand from the building regs my external walls should be atleast 0.030 W/m2K. My builder is building the extension walls with outer brick leaf, 100mm cavity, inner blocks are concrete the heavy type :-). and we will use bonding and plaster inside not plasterboard. Now I...

Hi, I am intending to use interlocking concrete tiles on my new roof probably the marley modern ones but my builder/roofer seems to think he doesn't need to nail/screw them as they interlock. Can someone please give some advice so I can ensure that I get a good job done and not have to...

Thank you all. I appreciate your points and I will speak to the builder when I see him. I would prefer matching mortar as it looks nicer and majority of extensions I see have light brown mortar. Obviously I would not want to compromise on the quality/strength of the mortar by using different...

Thanks for the replies chaps. Will the dark sand and less cement affect the strength of the mortar? What ratios would be best?

Hi, I have taken the following photos with my phone, not the best quality but you can see the mortar getting on the bricks, top left (2nd photo). The colour is light grey but not sure if it should be more browner closer to the brick colour. The original house has mortar which is more of...

Hi, I have recently started an extension and my builder has built one side of the wall and has gone on holiday and will be back next week. However I need some advice as to whether his doing this properly. The mortar has dried and is light grey rather than the brown I was expecting and the...