Section 1
On inspection of the terracotta tile roof surfaces it was observed the surface was mold and mildew marked however appeared in a serviceable condition
Note: – roof requires high pressure cleaning to remove mold and markings
However on inspection of the terracotta roof tile units the following was observed –
- There was a loose valley tile to the 2nd storey southern roof elevation
- Some valley tiles were loose and not secured by tile clips
Normative/Informative provisions
AS2050 – Installation of roof tiles
1.4.2 Weather resistance The completed roof shall be sufficiently free from defect or distortion to be weatherproof
2.4 FIXING SYSTEMS
2.4.1 General Fixing systems may comprise either, singly or in a combination, mechanical fastenings such as, clips, nails, screws, adhesives, fillers and cement mortars.
Section 2
On inspection of the roof ridge and hip cappings it was observed capping mortar pointing was broken and weathered exposing the open tile capping joints to moisture ingress into the roof space below
Normative/Informative provisions
AS2050 – Installation of roof tiles
2.4 FIXING SYSTEMS
NOTES:
1 Laboratory testing has shown that only a minor deflection of truly adherent mortar will result in a breakage of either or both ridge or tile upon deflection of the roof. In most instances of mortar bedding and pointing, a truly long-term adherent bond does not exist. Experience has shown that roofs in practice deflect and mortar does inevitably break.
It is therefore recommended that mortar bonding should not be used as a minimum mechanical fixing
NOTES:
- Ridge tiles and fittings may be laid without bedding or pointing provided they can be adequately fixed by other means (see Table 1).
- Bedding and pointing applied to tiles may require the formation of weep holes to permit drainage.
- Structural movement may result in the cracking of bedding and pointing.
Section 3
On inspection of the roof eaves and fascia guttering above the following was observed –
- There was marking and water staining to the roofs eaves lining of the dwelling
- On inspection of the roof fascia guttering above, it was observed the roof tiles overhung the guttering by more than 50mm and some tiles projected to the edge of the fascia gutter line
Normative/Informative provisions
Roof tiles AS 2050 Installation of roof tiles
3.3.5 Eaves tiles Eaves tiles shall overhang the fascia or tilting batten by an amount sufficient
(a) to ensure that water discharges into the gutter; and
(b) to permit replacement of the gutter.
NOTE: This will usually mean an overhang of about 50 mm ±15 mm.
Section 4
On inspection of the roof space the following was observed –
- There were tears in foil sarking to various areas in the roof and lower garage roof space
- There was sarking not overlapping lower sarking sheets in the garage roof space
- There was foil sarking that appeared to be decomposing in various areas of the roof and lower garage roof space appeared to be allowing conduction of water into the roof space and appeared not to adequately allow water to disperse directly to the eaves fascia guttering
Normative/Informative provisions
3.1 SARKING
3.1.1 General Sarking shall be provided for all roofs where the design wind velocity is greater than 47 m/s. Where required, pliable and reflective-foil sarking shall be fixed in accordance with AS 4200.2. Rigid or semi-rigid sarking shall be fixed to provide adequate means for the water to discharge to the eaves.
3.1.2 Damage
Care shall be taken to avoid damaging the membranes during installation or tile-fixing operations. Any tears or punctures, other than those caused by the installation of fixings over rafters, shall be repaired in accordance with AS 4200.2
Section 5
On inspection of the 2nd storey internal ceilings and garage ceiling to the dwelling the following was observed
- There was consequential staining to the 2nd storey bedroom 2 ceiling
- There was consequential marking and water staining to the garage ceiling south western corner
