Thanks johnd2. I've pasted below the actual descriptive bits that seem to have issues. As always highly appreciative of any opinions! I'm going to have a call with the surveyor this week so if anything stands out please say and I'll ask them about it in detail.
Thanks again!
CHIMNEYSTACKS
Masonry chimneystack with chimneypots (the pots are decayed and are subject to future eplacement). The stack was built without damp proof trays and penetrative damp ingress is inevitable.
ROOF COVERINGS
The tiled roof coverings etc. require a remedial overhaul and upgrade to ensure long-term integrity. There is a bulge to the party wall intersection which occurs due to general and roof frame settlement. Notwithstanding, it seldom represents a significant defect.
The flat roof covering comprises mineral felt which has a short life span and can fail at any time and is at the end of its serviceable life.
Remove the excess moss growth (transmits damp through tiled covering) and repair/replace any defective tiles. Carry out pointing repair to the ridge and verge tiles and ensure the roof covering is watertight. Install roof tile vents in accordance with manufacturer’s recommendations to reduce the potential for high humidity and condensation related defects within the roof space void.
Renew the flat roof covering and make good to any timbers affected by rot. Abutment upstands are to be sealed with code 4 lead flashings and the roof covering is to be suitably laid-to-falls, insulated, and vented if required. All works to be carried out in accordance with current regulatory requirements (BS-6229). A building notice is to be served to the local building control dept.
ROOF CONSTRUCTION
There was some distortion to the roof frame, though there was no evidence of any significant defect at the time of the inspection. Some flight-holes were noted to the roof timbers which is indicative of woodworm attack. The underfelt is defective in places and has been poorly lapped and requires remedial repair to ensure fully secondary protection against damp ingress, moreover the felt is ageing (UV degradation evident) and you are advised to budget for the high cost of future replacement (necessary to remove the roof tiles).
There was evidence of damp decay to the masonry party wall and chimneybreast and some minor fungal decay to the adjacent/abutting roof timbers. Moreover, some missing brickwork was noted to the wall and remedial waterproofing, application of timber treatments and general making good etc. is required.
In the interests of long-term stability a competent carpenter is to reinforce the roof frame (add collars at 2 metre centres). Apply timber treatments to the timber roof frame (eliminate the woodworm decay and protect against fungal attack/spread). Overhaul/repair/patch etc. the underfelt and ensure it provides full secondary protection against damp ingress. Upgrade the insulation to accord with current energy saving standards. Spotlight fittings in contact with flammable materials (fibreglass etc.) and/or those at risk from moisture penetration must have fire-rated/moisture cap protection provided in accordance with BS-7671. Make good to the masonry party wall (fill any voids) and ensure it provides full firebreak compartmentation.
MAIN WALLS
The property comprises traditional uninsulated cavity load-bearing masonry walls. The wall coverings may disguise defects that would otherwise be evident, therefore the risk must be accepted. Cavity walls are formed by two separate masonry skins with a gap (cavity) between them. They are held together by metal wall ties that provide structural strength and stability. The ties normally comprise steel with, or without, a sacrificial galvanized zinc coating. The structural stability of the building is very dependent on the condition of the wall ties. Due to the age of the property and potential risk of metal wall tie decay a further investigation is advised.
In view of the age of the building it cannot be assumed that window and door openings are provided with adequate lintels to support the masonry above. Consequently, the need to provide these in the future cannot be ruled out, particularly when renewing door or window frames. There was some slight opening head settlement, though there was no evidence of any significant defect, and the settlement was within acceptable tolerances at the time of the inspection.
The masonry behind the rendered wall coverings (risk of defects to concealed areas) may comprise calcium silica brickwork and it is subject to excess expansion and contraction and consequential cracking (budget for periodic maintenance – crack fitting/render repairs).
The foundations are likely to be shallower than current regulations require and are more at risk from subsidence defects. Moreover, during the period under which the property was originally built, it was fairly common to construct load-bearing walls without suitable lateral restraint to floors and roofs. Notwithstanding, there was no evidence of any significant defect to the property and it appeared sound at the time of the inspection. Several wall cracks were noted, particularly to and around the openings, to the rear extension intersection with the rear severed chimneystack and to general rendered wall areas – possible sulphate attack accentuating wall render cracks). The movement/cracks, however, were within acceptable tolerances at the time of the inspection and no remedial work, other than filling of cracks to prevent water penetration and frost deterioration, is currently necessary. There is some evidence of mortar pointing failure and you are advised to budget for the high cost of full wall repointing. Some defective/de-bonded wall render was noted, and it was evident that the original door opening to the side of the extension has not been fully filled (half width only) and this should be completed.
SUB-FLOOR VENTILATION
Voids beneath timber ground floors require adequate ventilation to minimize dampness, which can cause timber rot and decay (including fungal attack) and a remedial upgrade is advised (current sub-floor ventilation provisions are insufficient).
Essential repair Install additional sub-floor ventilation provisions (air-bricks/grilles) to the timber sub-floor voids and ensure the space between the units does not excess 2 metres and clear all obstructions/debris to the current in-situ provisions.
FIREPLACES, FLUES AND CHIMNEY BREASTS
The chimneybreast construction has been largely retained, except for the removed chimneybreast in the dining room. Whilst there was no evidence of any significant structural defect at the time of the inspection, we suspect the remaining chimneybreast (no support bulkhead enclosure) has not been supported in accordance with regulatory requirements, and a remedial upgrade is advised to ensure long-term stability.