How do I avoid mould developing in the brown grout joints in my bathroom?

Mapei Ultracolor Plus Brown includes BioBlock Technology, which is Mapei’s built-in mould-resistant additive designed to inhibit the growth of mould and mildew within the grout joint itself. While no grout is entirely maintenance-free in a steamy bathroom, this formulation significantly reduces the risk compared to standard grouts, making it a practical choice for shower surrounds and splashbacks.

How much of the 5 kg bag will I use for a typical kitchen splashback, and how do I calculate the right quantity?

As a starting point, 1 kg covers around 1.33 m² of 100 mm x 100 mm tiles with 3 mm joints, meaning the full 5 kg bag covers approximately 6.65 m² at those dimensions. For a standard kitchen splashback this is often more than enough, but if you are using smaller mosaic-style tiles or wider joints you will use more grout per square metre, so check your tile size against the coverage rate before purchasing.

Mapei Ultracolor Plus Brown - 5kg

Description

Mapei Ultracolor Plus is a high-performance, quick-setting grout that combines efficiency with durability. Suitable for joints up to 20mm wide, it's mould-resistant, water-repellent, and features anti-efflorescence properties for consistent, uniform colour. This fast-drying cementitious mortar in Brown is perfect for both interior and exterior wall and floor applications and is easy to apply and clean.

Key features

Suitable for floor and wall use throughout the home

Key facts

Weight: 5kg
Sold per: Bag
Suitability: Floor, Wall
Material: Grout

Coverage: approx. 15 sqm (dependant on size of joint)
Colour: Brown
Range: Mapei

Delivery and returns

Standard delivery £25.00 1 to 3 working days. Free over £299.
Next day delivery £45.00 Order by 12pm, Monday to Friday.
Choose your day £35.00 Pick a weekday at checkout, at least 3 working days ahead. Not offered when free samples are in your basket.

Delivering to Northern Ireland (BT postcodes)? Email [email protected] and we will arrange it. All prices Exc. VAT.

Delivery policy

Returns and refunds Damaged or wrong items: tell us within 48 hours.

FAQs

Yes, Mapei Ultracolor Plus Brown is specifically suited to kitchen walls and its water-repellent surface makes it highly resistant to the splashes and grease that are common in a kitchen environment. The easy-to-clean finish means everyday marks can typically be wiped away without the grout absorbing stains, helping to keep the brown colour looking fresh over time.