External Timber Cladding Remedial Works - Galeri Caernarfon

INVITATION TO TENDER External Timber Cladding Remedial Works Galeri Caernarfon Galeri Caernarfon invites tenders from suitably qualified and experienced contractors to undertake remedial works to the existing external timber cladding system at Galeri, Doc Victoria, Caernarfon. The purpose of the project is to remediate defects within the existing timber cladding façade, extend its service life, improve weather resistance and ensure the continued safe performance of the building envelope. Tenderers are required to provide all labour, materials, plant, access equipment, supervision and associated services necessary to complete the works described within this Invitation to Tender. Project Overview The works comprise the careful removal and reinstatement of existing timber cladding, replacement of breather membrane and battens, installation of new timber where required, and all associated access provisions. The existing cladding has been constructed in timber. It is intended that approximately 80% of existing timber boards will be salvaged and reused where practicable. Galeri intends to appoint a competent contractor capable of carrying out the works safely, efficiently and with minimal disruption to the operation of the building. Scope of Works The successful contractor shall provide all labour, materials, plant, supervision, temporary works and documentation necessary to complete the project, including: Design, management and coordination of all site activities. Provision of suitable access equipment and working platforms. Careful stripping of existing timber cladding elevations in sections to minimise weather exposure. Careful removal and storage of existing timber cladding boards for reuse. Removal and disposal of membrane. Supply and installation of new membrane suitable for external cladding applications. Inspect exposed battens following removal of the cladding and identify any battens that are deteriorated, damaged, decayed or otherwise unsuitable for continued use. Remove and replace battens identified as defective. Supply and install new treated battens and associated support components where required Reinstallation of salvaged timber cladding boards. Supply and installation of replacement timber boards only where existing boards are damaged, defective or otherwise unsuitable for reuse. Supply and install new battens and cladding to the top of the stage doors, including improvement of the existing detail by forming a suitable capping piece with drip detail as a preventative weathering measure. Replace all defective or inappropriate cladding fixings with marine-grade A4 / Grade 316 stainless steel cladding fixings (flat head type), installed in accordance with the cladding specialist's recommendations and with appropriate edge and end distances. Protection of the building fabric during the works. Waste management and lawful disposal of redundant materials. Site supervision and quality assurance throughout the project. Provision of completion documentation. Tenderers shall undertake a site inspection and satisfy themselves regarding the extent, condition and fixing arrangement of the existing cladding system, including all materials proposed for retention or reuse. Existing Cladding System The existing external façade comprises a timber cladding system formed primarily from timber boards fixed to battens over a breather membrane. Based upon previous inspections and cost planning information, the following assumptions have been made: Approximately 80% of existing timber boards are anticipated to be suitable for reuse. Approximately 20% of timber boards may require replacement. Existing electrical fixtures mounted to the façade will be removed and reinstated by others unless otherwise agreed. The works shall comprise repairs and partial replacement to the existing timber cladding façade and return elevations. The works do not include full replacement of the facade. Tenderers shall include for the localised replacement of defective boards, battens and fixings as necessary to complete the works. Tenderers shall verify all quantities and dimensions prior to commencement. Specific Works Requirements The contractor shall: Access Provision Provide suitable access systems and working platforms for the duration of the works. Ensure all access equipment is inspected and certified. Maintain safe public access around the building at all times where reasonably practicable. Timber Cladding Removal Remove existing timber cladding in carefully controlled sections. Sequence works to minimise exposure of the building to adverse weather. Label and store salvaged boards for reinstallation. Exercise due care to maximise the recovery of reusable boards. To achieve the best possible visual consistency across the main façade, any replacement boards displaying greater variation in colour or weathering may be reserved for installation within the four return sections leading to the external fire escapes. Membrane and Batten Replac