With the permission of the Ceann Comhairle, I propose to take Questions Nos. 16 to 18 inclusive, together.
While this matter is one which concerns Dublin Corporation, who ordered and let the houses, the National Building Agency who organised their construction and the contractor who built them, I have kept in constant touch with developments regarding the investigations into the problems affecting the roof trusses in these houses.
I have received a copy of the final report of the Institute for Industrial Research and Standards, who were commissioned by the agency, in consultation with Dublin Corporation, to examine the houses, determine the causes of the roof movements and assess the adequacy of the remedial measures proposed by a firm of structural engineering consultants who had been specifically engaged by the agency. The institute consulted an expert from the British Building Research Station during the course of their investigations.
The investigations revealed that serious defects in the roofs of the houses at Finglas South, section 2, were confined to three house blocks, comprising 18 houses in all and that the remaining 328 dwelling were affected to a minor degree only. The report of the institute concluded "that the principal cause of the progressive roof movements encountered on site was the out-of-plumb of trusses as built". The report indicated that in 94 per cent of the dwellings, the movement of roof trusses did not exceed two inches. Copies of the report have been available in the Oireachtas Library since 16 November 1978.
The contractors for the scheme have been instructed by the National Building Agency to carry out the remedial works recommended by the structural engineering consultants and approved by the Institute for Industrial Research and Standards. This is a matter to be dealt with by the parties to the contract—the contractors, and the agency acting on behalf of the corporation. In the circumstances, it would be inappropriate for me to make any comment on that aspect of the matter.
I am satisfied from the investigations carried out and the remedial measures proposed by the specialist personnel that all necessary steps are being taken to remedy the defects in these houses and that the occupants have no cause for concern in regard to the structural stability of their houses.