Basement Conversion Construction Stages

Week 1:: Erect independent hording and access area to front of property.; Create initial external opening (where possible) to the basement area and provide temporary weather- proofing and secure.; Provide temporary supports where necessary.; Supply external washroom facilities.; Supply temporary electrics and water to basement area.
Week 2 - 8:: Remove soil, create a trench around the property perimeter, expose existing foundations and underpin where necessary.
Week 9 - 11: Once all underpinning is completed, excavate the bulk of the soil & dispose accordingly.
Week 12 - 13:: Cut into existing brickwork and prepare to receive structural steel bearing spreader plates.; Install approximately 100 x 600 x 20 mm structural steel spreader plates to support steel beams.; Install heavy duty steel beams ( RSJs ) and universal beams ( UB ) coated with intumescent coating to provide a minimum of 30 minute fire resistance.
Week 14:: Create new reinforced basement floor slab with damp proof membrane.
Week 15 - 17:: Supply and fix a cavity drain waterproofing system inclusive of base drain to slab, sump and pump for discharge (2 No. Submersible pumps with back-up alarm- basement Masters to supply.). and screed topping over membrane.
Week 18 - 20:: The construction and the formation of external light wells to front & rear of property where necessary.; Approximate size 2M x 1M by approximately 1.8M deep with drainage and new windows to match existing windows above and metal railings around light well opening.; A cat ladder to be installed in either light well as a secondary means of escape.
Week 21 - 23:: Dry line around the external wall perimeter, cavity to be filled with quilted insulation.; Internal partitions are formed with the use of metal stud dry lining system or wooden stud partitioning (which ever is more suitable) filled with quilted insulation.; Ceilings - new suspended ceilings to be constructed below existing floor joists, insulated with quilted insulation, finished with laminated plaster board with skim finished on exposed side to create a half hour fire rated ceiling.; All first fix electrics and plumbing to be completed.; Plaster board with 12.5mm and skim.
Week 24 - 25:: All existing doorways are temporarily sealed.; Install new stairwell, closed tread softwood string staircase to provide access to converted area. Complete all Second fixing: to include:-Electrics, plumbing, skirting, doors architraves.
Week 26:: Arrange final inspection with the Building Control Dept to have the works approved.; Clear site and hand job over.