Choosing the Right Bath Material When Weight Is a Concern

Choosing the Right Bath Material When Weight Is a Concern

Posted by Vincent – Manager on

Our customers often ask a straightforward question: “How much does this bath weigh, and will my floor support it without any issues?” The answer involves a few considerations.


1. Floor Weight Capacity:

  • Concrete floors in newer houses or apartments can handle significantly more weight than older timber floors or timber decks.

  • Whether you are planning to install a bath yourself or use a builder, you should confirm your floor’s weight-bearing capacity to ensure a safe installation.

2. Bath Weight and Material:

Baths vary widely in weight, ranging from as light as 40kg to as heavy as 2,000kg. Here’s a breakdown of typical bath materials and their weights for baths measuring 1700 to 1800mm in length:

  • Acrylic material: Approximately 40kg

  • Copper material: 40 to 50kg

  • Stone composite material: 110 to 130kg

  • Concrete material: 200 to 400kg

  • Natural stone (Riverstone, marble, petrified wood…): 1500+ kg (the heaviest one we have sold so far was 2,500kg)

    3. Considering Water Weight:

    Remember to account for the weight of water when choosing a bath. Assume the bath will be completely full:

    • Each litre of water weighs 1kg.

    • As an example, if your bath has a volume of 250L, the water will weigh 250kg once the bath is full.

    • People’s body density is roughly 1, so whether you fill your bath with water only or a mix or water / people does not change the total weight.

    4. Total Weight Calculation:

    Let’s calculate the total weight for each material, assuming a 250L volume:

    • Acrylic: ~40kg (bath) + 250kg (water+people) = 290kg

    • Copper: 40/50kg (bath) + 250kg (water+people) = 290 to 300kg

    • Stone composite: 110/130kg (bath) + 250kg (water+people) = 360 to 380kg

    • Concrete: 200/400kg (bath) + 250kg (water+people) = 350 to 550kg

    • Natural stone: 1500+kg (bath) + 250kg (water+people) = 1750+ kg

    5. Additional Information:

    Our spec sheets include bath weights, total volume capacity, and the average water volume needed to fill each of our baths to a comfortable level (10cm below the top edge) with one person.


    Feel free to reach out if you have any further questions about bath weights or volumes for your project!

    acrylic bath volume Bath weight concrete copper marble natural stone petrified wood riverstone stone composite

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