tommyleestaples

Thanks will take a look. Just noticed Jackoboard do these fixings, I wonder how they would be with thermalite blocks

Sorry what do you mean BG do a knock in for this purpose?

Hi all, I had an extension done and one of the walls in the en-suite is thermalite which is nice and level. I need to board this wall out with insulated tile backer boards. I was planning to prime the thermalite wall with SBR Then apply a rapid set flexible cement based tile adhesive to the tile backer board with a 1/4 inch trowel and then fit the board to the wall. Once the tile adhesive has dried I was going to mechanically fix the board as well. Does this sound correct?

Thanks for your reply Beau. I have used 1.5mm T&E and they are only LED spotlights. Could of prob got away with 1mm. So sounds like cables first, then insulation with cable coming through the insulation to the individual spot lights

I need to run lighting cables for the ground floor lights in the ceiling. I will be doing this from below. The void between the two floors will also be filled with 100mm acoustic insulation. Should the lighting cables sit above or below the acoustic insulation.

Any issues with offsetting wall units from the wall with 10mm wooden batten? Just need to bring them forward by 10mm

Thank you very much. I will get some top soil ordered up!

Hi all, I have a friend who can help me this weekend so was going to get them to remove some concrete posts. There are 3 to remove, one will be replaced with a new concrete post and the other 2 are in the wrong places. I am not in a position right now to put the new concrete posts. Therefore planning to back fill with soil the two holes that are in the wrong place and will try and compact it down. I would appreciate feedback on this. With the post that needs to be replaced for now could I just leave the concrete post in the hole ready to just be pulled out and replaced at a later stage? Thanks

I need to do this soon as the steels sit proud of the joists. If I batten out then I can get a nice flat ceiling. I was planning to use roofing battens at 300mm centres but it seems like 400mm would be enough with 12.5mm fire rated plasterboard? As I am using roof battens would you guys advise putting two battens side by side where the boards join?

Thanks for the advice Mr Punter.

The builders done suspended timber floor to match existing floor. Please see below a photo I believe the spacings are 400mm When I have run U Value calculators it shows I need 130mm PIR between the joists. I have included a picture of build and calculation.

Thanks for your comments. I need a u value of 0.18 W/m²K for sign off. If I could do it this way then I would, it would be much cheaper but in order to get the Uvalue needed I would need to have loads of it under there and also I have read somewhere that mice/rats love it

I have just had an extension done and before it can be signed off by building control they want to see the whole ground floor which is suspended timber floor has been insulated. In order to achieve the U-Value required they have told me it will need to be 130mm of PIR. However, my joists are only 100mm so I would appreciate any advice if people do this for a living or have had to do it on their own property. I was planning to friction fit, seal up any gaps with expanding foam then tape joins to create a vapour barrier. I was also thinking of using roof battens underneath to give me the extra depth I need or using light duty brackets fixed to the joists. The only problem I think I will come across is in some places there is pipework just under the joists and then you have the sleeper walls. Would you advise cutting section out of the PIR insulation for the sleeper walls or just putting a piece in that is less depth such as 100mm? Thanks

Hi all, I have a square en-suite which has 3 walls made of stud work and then one wall is thermalite blocks. I am looking to use insulated tile backer boards with a shower tray. I just wanted to make sure I was doing it right! I am planning to board the walls with 12mm Jackoboard insulated tile backer board right down to the Moisture resistant T&G chipboard. There shower tray area with have a coat of SBR and then bedded onto a sand and cement bed with Classi Seal Shower Tray sealant tape as an upstand around shower and then it will be tiled which will overhang the shower tray to ensure water runs into the tray. The remaining floor will be boarded with 6mm Jackoboard insulated tile backer board cut around shower tray and on a bed of tile adhesive and then screwed to the floor. Please let me know if I have done anything wrong or missed something important.

Hi all, I am looking to board the inside of my ensuite and then tile. 3 of the walls are stud walls at 400mm centres and then one wall is a very flat thermalite wall. What tile boards would people recommend? Looking for something 12mm thick. I was looking at Hardie backer boards but read that they can absorb water if you have a leak where as some of the other back boards are water repellent. Advise would be greatly appreciated.