Compressive strength is compressive strength, irrespective of the material, although certain dense blocks can be produced up to 30N in strength for special structural jobs.
No, the costs are the same.
Absolutely. Masonry can achieve all levels of the Code for Sustainable Homes. Also responsible sourcing – compliance with BES 6001 – shows that aircrete can match the credentials of timber frame and gain CfSH tier level 1 and Thermalite is a UK sourced product.
Yes, but Thermalite Turbo needs to be of 215mm width or greater to prevent possible bond failures that may occur with cement rich renders due to the product’s lower strength. Always follow manufacturer’s guidelines with regards to mix design and surface preparation.
Yes. You need to use a normal high speed twist drill, not a masonry one, remove hammer action and use a proprietary wall plug. The secret is not to oversize the hole.
Cut nails of tapered aluminium or mild steel form an excellent bond when driven into Thermalite. Helical nails also provide excellent fixing. Nails should be driven in at approximately 450mm centres and at least 75mm into Thermalite Turbo and 50mm for all other Thermalite products.
Yes, all Thermalite blocks are suitable for use below ground. Turbo can be used in up to Design Sulfate 3 (DS 3) level and all others up to DS 4 levels.
Yes as long as they are constructed in line with Building Regulation and Robust Detail requirements with regards to width, density and finish.
You do not need to apply paint but consideration should be given to the fact that colour variation between blocks can occur. It is recommended that a sample panel is erected before construction to ensure acceptance of finish.
They are not an aggregate block so should not be handled as one. Walls built with lower density blocks, like all masonry products, will be prone to damage if there is not adequate provision for movement.
Thermalite large format blocks are simply two blocks in one and should be laid with the 430mm dimension as the bed height. The use of these blocks reduces the number of mortar joints required in a wall, increasing productivity.
There are a number of quick-fit approved face fix ties that are used to tie non corresponding course heights – no pre-drilling is necessary.
Above ground it is 1:1:6 cement: lime: sand; 1:6 cement: sand with a plasticiser or 1:5 masonry: cement. Below ground it is 1:4 cement: sand or 1:½:4 cement: lime: sand.
Not as long as the walls have been prepared for rendering in line with the recommendations.