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We are Part of the Thomas Armstrong Group
Airtec, Ultralite, Insulite and Dense Concrete block surfaces offer an excellent substrate for accepting mortars and no pre-treatment is required other than ensuring that block surfaces are clean and free of dust and debris.
Generally, in order to avoid unsightly cracking, the weakest mortar mixture appropriate to the structural requirements should be selected as per BS 5628-3.
For most applications above dpc, we recommend that a Class iii designation mortar is used.
There is no need to wet the blocks before applying mortar. The consistency of the mortar mix should be adjusted to suit the suction of the block. For example, a slightly thinner mortar mix would suit Airtec blocks whose suction is higher than that of an Ultralite, Insulite or Dense Concrete block.
Recommended Mortar Mix Values
The following table shows the recommended mortar mixes for our blocks. A slightly weaker mortar mix should be used wherever Airtec aerated concrete blocks are used.
1 : 1 : 5-6
1 : 5-6
1 : 4-5
1 : 1 : 5-6
1 : 4-5
1 : 2 : 9 or 1 : 1 : 6
1 : 6
1 : 5
1 : 1 : 4.5 - 5
1 : 4
Preparation and Good Practice
Thin Joint Mortar for Airtec Aerated Blocks
Airtec Aerated block walls can be constructed using either conventional 10mm mortar joints with mixes as shown in the table above or using 2mm Thin Joint mortar.
Thin Joint mortar is widely available in the form of 25kg bags of dry, pre-mixed powder. Mixing is simply done by adding water to the powder according to the instructions on the bag and if made correctly will ensure that the correct mortar strength is achieved for use with aerated blocks.
Thomas Armstrong (Concrete Blocks) Ltd
Part of the Thomas Armstrong (Holdings) Ltd
T: 01900 68211
F: 01900 602672