How Much Waterproofing Do I Need for My Wetroom

8/12/2019 How Much Waterproofing Do I Need for My Wetroom

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How much waterproofing do I need for my wetroom?

When tanking your wetroom project it is of critical importance to orderthe correct quantities of CE approved waterproofing materials. If in any

doubt you can phone us on 01387 270252 and take advantage of ourfree calculation service. Alternatively you can use the guide below tocalculate your requirements:-

Area to be tanked

Min. 100mm

"Turn-up"

The Entire floor area of the wetroom MUST be waterproofed.

The bottom area of the walls MUST be waterproofed all the way around theroom, turning up from the floor by min.100mm

Any walls in the immediate shower area or "wet zone" should be tanked

floor to ceiling; this area would normally extend at least 1.2m from theshower head. If using a shower screen the wall waterproofing can finish100mm beyond the screen. On walls with no screen the waterproofing canbe angled down towards the floor over a further meter, this area is thesplash zone.

Wet zone

Splash zone


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How do I calculate the surface area to be waterproofed

Floor If you have a rectangular or square shaped room, just multiplythe length in m. by the width in m.

If you have a less regular shape try and break it down in to rectangle orsquare sections then add the answers together. If there are any curvedareas these can normally be squared up for calculation purposes.

Walls Firstly work out the area of the 100mm "turn up" onto the walls.To do this simply add the length in m. of every wall in the room togetherand multiply the answer by 0.1

2.5m

1.2m

2.5 x 1.2 = 3 sq.m. floor area

2.95m

2.8m

1.7m

(a)

(b)

Area (a) is 1.5m x 1.25m = 1.875 sq.m

Area (b) is 2.8m x 1.7m = 4.76 sq.m

Total Floor area = 1.875 + 4.76 = 6.635 sq.m

1.25m

1.5m

2.5m

2.5m

1.2m1.2m

2.5m + 1.2m +2.5m + 1.2m = 7.4m

7.4m x 0.1 = 0.74 sq.m. Area of 100mm turn up


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Walls Immediate Shower Area

To calculate the remaining wall area to be coated measure the length ofthe walls likely to be subjected to driving water in the vicinity of the

shower. This area would typically be 1.2 m from the shower head. Thisis called the wet zone, to work this out simply multiply the length of thisarea in m. by the height of the walls in m. If using a shower screen thewaterproofing can terminate 0.1m beyond the screen.

Where no screen is used slope the waterproofing down to meet the100mm turn up over an additional 1m. length. This is called the splashzone, for each angled splash zone multiply the wall height in m. by 0.5m

We have now worked out the square meters required to waterproof thewetroom. Just add up all the totals as in the example below:-

Total Floor Area = 3.0 sq.m.

Turn Up = 0.74 sq.m.

Wet Zone = 5.06 sq.m.

Splash Zone = 1.1 sq.m.

Total Waterproofing 9.9 sq.m.

2.5m

1.2m

1.2m

Wet Zone = 1.2m + 1.1m = 2.3m

2.3m x ceiling height 2.2m = 5.06 sq.m. forWetzone

Splash Zone = ceiling height 2.2m x 0.5m =1.1 sq.m.

1m

1.1m


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How Much Joint Tape do I Need?

You require enough joint tape to re-enforce the entire wall to floor junction around the perimeter of the room. In the example above this is1.5+2+1.5+2 = 7 lin.m . You also need to seal all other joints and

junctions, in the above example this relates to the two sides of theshower tray former that are facing out into the room as well as the jointin the flooring boards at point a). This works out at 0.8m+0.8m+1.2m =2.8 lin.m. Any wall to wall joints in the wet zone or splash zone of thewalls also need jointing tape. So at point (b) we also need a strip of taperunning from floor to ceiling = 2.2m. Therefore the total amount of

jointing tape required is 7+ 2.8 + 2.2 m = 12 lin.m.

What about Sleeves and Corners?

Large sleeves or "outlet sleeves" are normally used for connecting thewaterproofing material into your chosen waste outlet, you normally need

one per wetroom. The exception to this is if a toilet waste pipepenetrates the floor or if you have any other large penetrations in the

2.0m

1.5m1.2m

0.8m

0.8m

(a)

(b)


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floor or in the wet zone and splash zone areas of the walls. If this is thecase you would need one additional large sleeve for each penetration.

Small Sleeves or "Pipe Sleeves" are normally used for sealing the hot

and cold shower supply pipes where they penetrate the wall into theback of the shower mixer. Additional Small Sleeves will be required ifthere are any other small diameter pipes penetrating the floor e.g.radiator pipes or sink / toilet inlet pipes.

Pre-Made Internal or External Corners are very useful for detailing the jointing tape through 90 degree corners. To calculate the number ofcorners required simply count up the number of internal and external 90degree corners you have in your room. The examples below show sometypical configurations and the number of corners required for each.

We hope the above guide is useful in helping to calculate the exactwaterproofing requirement for your wetroom. If in any doubt just give usa call and we will be happy to work out exactly what you need.

Tel: 0845 2268283 or 01387 270252

Email : [email protected]

www.wetroomexperts.co.uk

4 x Internal Corners =

2 x External Corners =

5 x Internal Corners =

3 x External Corners =
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How Much Waterproofing Do I Need for My Wetroom

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