Is grout in showers waterproof

Grout for waterproof surfaces

Grout: Where should you grout waterproof?

Waterproof grout (€ 36.95 at Amazon *) is usually recommended for indoor tiles, especially in damp rooms. If puddles form on the floor in the bathroom and the shower water runs down the walls, no moisture should get behind the tiles.

Water under the tiles causes mold and leads to consequential damage in the long term - both in terms of construction and health. You should therefore also pay attention to the waterproofness of your grout in your kitchen, where puddles of water can occasionally appear!

Floor tiles need to be wiped regularly to remove dirt. Here, too, there is water contact again: Seal the joints watertight with grout to protect your floor from moisture damage.

Waterproof joints for outdoors?

Most of the outdoor areas are not covered and are regularly watered. It makes sense to let the rainwater seep between the stones, preferably in a bed of sand or gravel.

There is seldom a need to seal exterior surfaces with joint mortar to make them watertight. The disadvantages are obvious.

  • Rainwater cannot run off and floods occur.
  • Waterproof grout costs more than water permeable grout.
  • You may need to install expensive fixtures such as drains and ducts.
  • The progressive surface sealing is damaging the environment.
  • You will likely pay higher surface wastewater fees.
Also note that the waterproof grout needs more time to set completely than the water-permeable one: Protect the freshly grouted areas from the weather and other stresses for a long time!

Author: Yvonne Salmen - Note: All information is provided without guarantee

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