About this deal
The measurement of construction moisture can also be undertaken using the carbide bomb method. Readings of less than 2.5% for all cement based subfloors and less than 0.5% for Calcium Sulphate subfloors must be obtained.
Cores may be taken to determine the depth of penetration and can assist in deciding on whether or not it is possible to prepare a surface for overlaying. It may be necessary to carry out adhesion tests to ensure adequate adhesion is obtained on a contaminated surface. Immediately prior to applying any coating, topping or adhesive, ensure that dust from any preparation method employed is removed by vacuuming. Preparing concrete may be a dusty operation therefore appropriate PPE should be worn and good ventilation should be provided. Protection of walls, furniture and equipment should be planned.
Our Products
This Subfloor Preparation Guide describes the different types of procedures available to produce the most acceptable substrate possible, ready for the installation of one or more of our products. Shotblasting will produce a lining effect commonly known as tramlining. This can be minimised with operator experience, but will be visible when applying sealers or thin coatings. Shotblasting will highlight surface defects in the surface being prepared, this is particularly important when applying to old concrete. Note: 1. Most power floated slabs will be treated with a curing agent. In most cases this will be acrylic based, however, wax based curing agents or certain silicate based products may be present that will inhibit the bond to these surfaces and should A surface tensile pull-off strength of at least 1.5 N/mm 2 or in-situ crushing resistance test, with a maximum depth of indentation of 3mm, in accordance with BS 8204, is required onto a prepared subfloor before the application of floor smoothing underlayments and serves as a good guide as to the integrity of the floor.
Any old adhesive residues should be removed by mechanical methods such as scraping, shot blasting and grinding etc. Certain underlayments such as STOPGAP 1200 PRO are During the laying of the floorcovering an ambient temperature of at least 18°C must be maintained along with a floor temperature of at least 10°C. The type and condition of the subfloor has a direct influence on the installation and performance of a floorcovering and the importance of subfloor preparation cannot be emphasised too strongly.
Plywood must always be overlaid with STOPGAP 700 Superflex prior to the installation of a resilient floorcovering. Some textile floorcovering can be directly applied to chipboard.