cavity wall

Looking to make a cavity wall for an outbuilding. It’s around 500 blocks and 450 bricks, with 50mm PIR in the cavity. Straight forward square building. How much am I looking at for labour if I source the materials myself?

Hi All, Hoping i can get some assistance, my builder seems to have gone walkabout as I started finding some flaws with his work and after making various excuses that everything was fine he is no longer responding to me. I was in the midst of a garage to habitable room conversion, but noticed...

I have noticed on the internet and in books a cavity wall with double skin blockwork wall doesn’t have cavity trays and weepholes just is rendered. Why is that?

Hiya, thank you for reading this :-) The details are: the house is a 1987 build with: Red brick outer skin, Cavity (I don't have any more info about the cavity at the moment as all our stuff is in storage), Thermalite blocks, Thick plaster (12mm approx), And a skim coat of plaster. On top of...

Hi all, just wondering what people’s thoughts are on cavity wall insulation on a 1910’s built house constructed with lime mortar. I’ve read a couple of horror stories online about people installing modern cavity wall insulation into a period property which subsequently caused a multitude of damp...

Hello all :) Never built anything big before. I'm want to build a masonry 15m2 outbuilding as a gym. I want to use the building all year round and I can imagine a lot of body heat being generated. I plan to have an electric heater too for winter. I have two wall designs I would appreciate...

I've recently purchased an '80s semi-detached bungalow and currently in the process of renovation. Originally, the property was heated via a warm air system and water heater, but this was replaced ~10 years ago with a Combi Boiler CH/HW system. In the kitchen there is a cupboard in which was...

Please can i get some advice how to cut a small access door in this wall. The photo shows the back of my house which has a crawl space below the airbricks. I want to cut an access hole approx 50cm X 70cm to the crawl space, the proposed hole is marked with green colour. The wall is two skins...

Does anyone have any expericence of cavity wall clearing I have found the cavity walls have quite a bit of sand in them. The sand bridges the DPC and in some cases goes above 400mm above DPC. Aslo as you go down the wall it turns solid mortar. I was thinking of trying to get a rotary mutitool...

Hi all! I am currently building a 2 story extension. It’s a cavity wall, with 7n dense blocks outer leaf and a 3.6n aerated blocks for the inner leaf. What are peoples thoughts on expanded galvanised mesh? Do I need to use it in the blockwork? Is it vital? Is it overkill? Should I use it on...

Wondering if anyone can help, looking after some guidance please. I’m doing a loft conversion and currently reinstating the party wall edges. I had an issue with leaks prior to this and I believe it was due to having old concrete tiles on angle, without any lead flashing. I’ve attached a...

Hi guys, A bit of advice again please! Please see the attached image. Question 1: Is it ok to connect a new wall to an existing wall and have the outer leaf's flush? In the picture, the red bricks are the outer leaf of the existing cavity wall, and the grey and green blocks will be the new...

Hi Just wondering if someone could give me some advice on how brick layers in the construction industry go about building a cavity wall. What I have been taught is to rack back corners then use a string line to fill in the middle of the wall with bricks. However I've seen a few different...

I have been working on a wall in my kitchen underneath a window. The wall underneath and to the right of the window only had a single skin wall where it then meets a solid wall of the original house. To the left of the window is a complete cavity wall and I have extended it to underneath the...

Hi all, I wonder if anyone can advise. We bought a 1930s property and decided to sleeve off/bridge the airbricks that were already there to ventilate the underfloor. I heard that the cavities need ventilation too? Will bridging the airbricks afect the cavities? We are planning on installing...

I am a landlord and my tenants experienced issues with damp on the inside of a bay window and it didn't seem like there was an issue with condensation or ventilation (as is usually the case). I noticed a crack where the bay window render meets the brickwork on the outside of the house and...

Hi all Need to gain 20 mm height on soil stack,the point where the soil pipe exits the building,I understand water doesn't run up hill only option I seen to have is relocate exit on gable end and bring around corner, completely out the way.I would also run the two external waste...

Hi guys currently self building single storey extension,all great so far blockwork up cavity 100mm,minor issue I need to gain 100mm in height for ig lintel Concrete block external toplight internal Best options 100mm coursing blocks all the way around ? Or a cheaper way of cutting a few...

Hi my cavity walls fall half a metre below ground,just wondering why a weak semi dry mix is required,I understand for the walls not to cave in,but why a weak mix,couldn't I over order on c25 mix for the floor slab and fill cavity with this,save loads of time.. Thanks

Hi, I would like a view on how best to close the cavities around window and door openings. The wall is 7N blockwork on the internal leaf and rough stone on the outer, which results in a very undulating cavity size. I have 80mm tongue and groove insulation in a 150mm cavity. The stone is at...