Hardboard sheets are a man-made composite board that is also known as a high-density fibreboard. They are manufactured from wood fibres and chippings that are formed together under heat and pressure. Hardboard sheets are a versatile product that is firm, robust and an economical choice for most projects. Hardboard sheets are used for floorboards, furniture making, wall panelling and many other DIY jobs.
Hardboard sheets are often used with other materials overlaid on them like worktops or wood veneers to give a natural look. Hardboard has a smooth surface on one side with no natural marks or knot holes. It also resists scuffs and marks. The other side has a rough textured finish, this side normally goes face down most when using the wood for things like floor underlayment. Do check the instructions that the flooring manufacturer has given as some vinyl flooring types suggest using the hardboard sheets rough side uppermost. The hardboard sheets are a regular thickness all over, which means they are easy to work with. Hardboard sheets are resistant to humidity and temperature fluctuations which means they can be used to build a subfloor and be used with things like underfloor heating.
It is possible to use waterproofing primers on hardboard sheets to give them some moisture resistance, as without protection hardboard sheets will absorb liquids. If you are planning to paint the hardboard sheets you will need to start with a primer base to then paint onto, and build up the layers. To make hardboard sheets really firm and less likely to buckle if they do come into contact with moisture, you will need to condition them by airing them in the same temperature they will be used in for around 48 hours before use. If you can separate the boards during this time, then this will help them air properly.
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