TechDry AD (Techdryad Mortar Additive) is a liquid you add to the mixer with your cement and sand to make the mortar itself water-repellent. It is the standard partner product for Tech-Dry water repellent blocks - those blocks shed water, which also makes it hard for ordinary mortar to bond, and this additive fixes that while cutting efflorescence and water staining on the finished wall. Dose it at 1 litre per 40kg of cement in a 1:4 cement-to-sand mix; do not go leaner than 1:5 and do not add lime. It is not a waterproofing membrane - always do a pilot panel before starting the job.

Key Features

• Water-repellent mortar admixture - makes the mortar itself resist water, not just the blocks
• The companion product for laying Tech-Dry water repellent concrete blocks: it restores mortar adhesion to a hydrophobic block face
• Cuts efflorescence (white salt bloom) and water-borne staining on finished walls
• Improves workability and board life of cement/sand mortar
• Wall stays vapour-permeable - no significant change to breathability
• Non-toxic, non-corrosive, water-based, zero VOC
• Simple dosing: 1 litre per 40kg of cement at a 1:4 mix
• 20L drum lays approximately 1,000-2,000 blocks (manufacturer figure)

Specifications

• Weight: 20 Litre 20kg, 5 Litre 5kg