Section 02 SUBSTRUCTURE

Transcription

1 02 Section 02 SUBSTRUCTURE 1. Trenches to be level, square and free from loose material and standing water. Steps and sides of foundations must be plumb. 2. All tree roots must be removed. Trench depths may vary refer to NHBC Standards Ensure foundation depths take into consideration drainage depths within the vicinity of the plot. 4. All substructure, block/brickwork to be fully pointed and follow the relevant Standard Detail(s). 5. Do not breach cavities with block and beam. DPC must be present under beam ends. 6. Cap off all drainage to prevent debris falling in and creating blockages. 7. Telescopic vents must not be positioned within door openings or service meter locations whilst maintaining a maximum distance of 2m apart and 450mm from external corners.

2 8. Aco drainage to be only installed as per the Standard Details, generally at front doors where level or sloping towards the property. 9. Finished ground level must be 150mm below DPC. 10. Shingle must be installed prior to the sub-structure drainage being laid. 11. When positioning manholes and inspection chambers take care to ensure these are set out within the property s footpaths or landscaping. Avoid the manhole being half in, half out of the path. During construction, manholes must be protected and signed. 12. When constructing substructures ensure water services are built in with consideration given to frost protection.

3 SUBSTRUCTURE 02 Clean and tidy foundation excavation. Well formed foundation steps. Correct width bucket must be used for each trench. (Picture taken from outside trench.) Foundation coordinates to be accurately plotted, and checked by the Engineer and Site Manager. 2-1

4 02 SUBSTRUCTURE All substructure blockwork to be fully pointed. Ensure poured strips are level. Trench blocks - external wall centred on strip foundation. 2-2

5 SUBSTRUCTURE 02 Garage foundation - Ensure well presented, tidy finish. Pile positioning and mesh. Note spacers to corners to ensure adequate cover. Neatly compacted granular fill ready for sand blinding/ DPM, drainage capped off and sacrificial insulation to cavity. Neatly installed pre-cast concrete beam. 2-3

6 02 SUBSTRUCTURE Block and beam slurry coated and sanded off. For accurate results consider core drilling drainage penetrations in block and beam floors. All grouting to be completed prior to screed rails being built. Ventilators need to be installed at maximum 2m centres, 450mm from ends and fully pointed. 2-4

7 SUBSTRUCTURE 02 Soil pipes capped during construction. Area between soil pipe and insulation filled with fire resistant expanding foam. Use a brick or blockette to gauge (65mm-75mm) the toilet bowl outlet position if not dimensioned on the drawing. Haunching to drainage to protect from damage when insufficient cover is available. (Note Lintel to be installed as low as possible and ground conditions/heave to be allowed for.) 2-5

8 02 SUBSTRUCTURE 150mm ducts to be built in external walls for drainage penetrations. Lintels to be installed over drainage penetrations at lowest possible point. Openings to be sealed and vermin proof, ensure Rockwool or adequate expanding foam is installed. Note end caps in soil pipes during construction. Water pipe to be installed set off from blockwork. Insulation to be installed around pipe and duct to be gas sealed. 2-6

9 SUBSTRUCTURE 02 Check to ensure Drain running away from house Drain Test 1 - Testing draining prior to casting slab. Drain Test 2 Ensure pipework joined and falls correctly. Drain Test 3 - Soil pipe neatly taped to insulation. (Cap to be replaced following drain test). 2-7

10 02 SUBSTRUCTURE Ensure reinforcement follows engineer s design and has perimeter spacers installed. Ensure party walls are square, in line and 100mm cavity for masonry. Water pipes to be insulated and ducts to be gas sealed. All SVP s to be protected during construction. 2-8

11 SUBSTRUCTURE 02 Clear cavity, ready for Platinum Insulation to be installed. DPM bedded into slab. Blue bricks only to be used in line with site requirements. DPM bedded into slab. Sacrificial insulation MUST always be removed. Consistently sized and clean cavity, with fully pointed brick and blockwork. Must be checked prior to commencing superstructure. Slab insulation taped and joints staggered. 2-9

12 02 SUBSTRUCTURE Straight, plumb and clean masonry below DPC. Drainage to be completed and correctly supported with correct falls. Avoiding siting drainage on hard spots, ensuring ground below is stable, and bedded on pea gravel. Slab sanded off. Note artstone and manholes protected. Keep externals tidy and complete in line with brickwork. 2-10

13 SUBSTRUCTURE 02 External rainwater drainage pipes must be finished at least 150mm below DPC. Telescopic vents must not be positioned within door openings, maintaining a maximum distance of 2m apart and 450mm from external corners. Drainage location to avoid manholes being located half in, half out of the path. Sub-structure drainage must be laid on pea gravel. Slabs must be cut neatly around external door cills. Drainage is only required if paving is level or sloping towards door. If paving slopes away a 10-18mm gap is acceptable. 2-11