Gib Trade Finish Multi 1

Jointing Compounds

With GIB plasterboards, you need to make sure that you use the correct compound for jointing. We stock a comprehensive range of GIB® compounds that join GIB® plasterboard sheets to create a uniform finish ready for decorating. As joints can be subject to structural movement (e.g. frame movement) and to minimise the risk of the joint cracking, the mechanical strength of the jointing system is an important consideration when selecting which compound to use. Different compounds are suitable for different coats in a joint system. Typically three coats of joint compound are applied; a bedding coat, the second coat and a topping/finishing coat. Each coat must be dry before the next coat is applied, and completed joint treatment must be thoroughly dry before decorating. Normal minimum recommended drying time is 24 hours between each coat and before decorating. However air movement, relative humidity, temperature, the chosen product and machine tools can all have an effect on drying times and need to be taken into consideration. Compounds are either supplied in powder form that need to be mixed with water, or are supplied ready-mixed and can be used straight from the pail. Compounds harden either by simply drying (i.e. air drying compounds) or through a chemical reaction when the compound comes in contact with water and sets (i.e. a setting compound, also referred to as a plaster based compound). Compared to air drying compounds, setting compounds are generally mechanically stronger, faster to accept the subsequent coat, more cost effective, harder to sand, able to fill larger gaps and are supplied in powder form only. Air drying compounds can be supplied in powder form or more commonly in ready mix form, have little/no shrinkage and generally take longer to dry. The following pages detail which GIB compounds are better suited for particular conditions or preferences.