HHSRS VERSION 2

SEPTEMBER 2004

DAMP AND MOULD GROWTH

HHSRS VERSION 2

Vulnerable age

Related hazards

A) Living room

B) Kitchen

Persons aged under 15 years

Excessive Cold

DESCRIPTION OF HAZARD⁄S

Dwelling:

Multiple locations

Yes

No

Secondary hazards

Yes

No

C) Second bedroom

Rear

elevation

Front

elevation

1960's end-terrace, 2 bedroomed house

Background: This is a two storey, two-bedroomed end of terrace house built in the late 1960s of

non-traditional construction on an exposed estate designed to Radburn principles.

Living room: Rising and some pentrating damp with associated mould growth is affecting the

external gable wall in both recesses to either side of the fireplace in the living room.

Kitchen: Dampness caused mainly by condensation is affecting the whole of the front external

wall surrounding the window and adjacent ceiling and party wall in the small kitchen.

Second bedroom: Penetrating damp and some associated mould is affecting the end wall.

A)

B)

C)

There is hair-line cracking to the external render generally.

LIST OF RELEVANT MATTERS

A

B

C

3

-

-

2

-

2

2

3

2

2

1

2

2

2

2

-

3

-

-

3

-

-

-

-

3

-

-

2

-

2

-

-

-

-

-

-

A

B

C

LIKELIHOOD & OUTCOMES

1

Rising damp

2

Penetrating damp

3

Condensation

4

Mould growth

a

Energy efficiency

b

Background ventilation

c

Extract ventilation

d

Clothes drying facilities

e

Damp proofing

f

Disrepair (walls)

g

Exposed water tanks etc

h

Water using appliances

-

-

-

-

-

-

I

Plumbing⁄waste pipes

j

Rain water goods

k

Roof⁄sub-floor spaces

l

Small room sizes

# Secondary hazards

-

None

-

A

-

B

-

-

-

-

C

-

-

-

Key

3

Seriously defective

2

Defective

1

Not satisfactory

-

Satisfactory⁄NA

Repairing the dpc, re-rendering the external walls and providing mechanical ventilation

in the kitchen would reduce the risk to close to average levels - a score of 15, band I.

Improving the thermal efficiency of the walls would reduce the hazard further.

Improved Av:11

Score:

15

Average likelihood, outcomes and HHSRS score for hazards from damp & mould by

persons aged under 15 years in 1946-79 non-HMO and all dwellings,1997-99.

Justification

NEW RATING

Av: Nos

IMPROVE

Likelihood to

1 in

320

Outcomes to

0

1.0 10.0 89.0

%

Example

RATING

RATING SCORES AFTER IMPROVEMENT

Average: 11

Score:

4112

As well as damp, an occupant's exposure to mould growth, and associated spores, in

two of the ground floor rooms and in one of the bedrooms, will increase the risk of a

more serious outcome occurring.

< 0.05

< 0.05

%

0.0

1.0

21.5

77.5

< 0.05

0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 1.0

0.0

0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 10.0

21.5

0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 89.0

77.5

0.15 0.3

0.7

1.5

3

7

15

26

38 >

< 0.05

Average: 0.0

0.0

The presence of dampness in two of the main rooms on the ground floor and to the

second bedroom increases the risk of a major illness being caused or exacerbated by

the conditions, significantly above that for the average damp dwelling.

Justification

OUTCOMES

Class I

Class II

Class III

Class IV

Justification

130

75

42

24

13

7.5

4

2.5

1.5 >

240

< 4200 2400 1300 750 420

Average: 446

Example

2

Low

High

LIKELIHOOD

1 in

2

HHSRS VERSION 2

SEPTEMBER 2004

HEALTH AND SAFETY RATING SYSTEM SCORES

1946-79 House