Insulation.

Thermabate insulating cavity closers are to be installed

at door and window reveals /cills.

code 4 lead valley to LDA details on 15

exterior quality ply valley board - lead

dressed 150 vertical distance beneath

felt

Section AA 1:50

Section BB 1:50

Ground Floor Construction

Excavate to reduced levels. Floor construction to be 50mm c/s screed on 100mm

concrete slab with trowelled finish on 1000g vcl on 90mm Celotex GA4090 floor

insulation on 1200g polythene DPM (with min. 300mm overlaps sealed with tape)

linked with DPC on min 100mm well compacted hardcore blinded with sand or

hoggin.U value 0.19w/m2K.

Turn insulation up at edge of concrete slab for 25mm width.

Foundations.

To cavity walls to be 600mm wide trenchfill to engineer's specification. To internal

load bearing walls to be 450mm x 225mm concrete strip where shown. Generally

grade C15P concrete to BS 5328: 1991 or in accordance with BS 8110 Pt. 1: 1985 if

sulphates are present. Foundations to vary to suite nature of subsoil and Local

Authority / Approved inspector's requirements. Allow for installing clayboard in clay

ground conditions.

First floor Construction.

22mm flooring grade chipboard on timber joists 50 x 200 C16 joists at

400mm centres. Floor finish level throughout. Herringbone or solid

strutting at mid span unless shown otherwise on drawing. Alternative

18mm t and g boarding where shown on plan. Install 100mm Rockwool

sound deadening quilt between joists. 15mm 10kg/m2 plasterboard ceiling

to underside of joists. Double up joists beneath partitions

External Cavity Walls.

103 bricks external skin . 100mm cavity insulated with 50mm Celotex CW4050

cavity insulation batts fixed to inner leaf. 100mm Celcon block inner leaf. Finish

internally with 12.5mm plasterboard on dabs. U value of wall = 0.28 w/m2K.

(mass of block min 1350 kg/m3 min)

Provide stainless steel wall ties to BS 1243: 1978 to be a max. 450mm centres

vertically and 750mm centres horizontally. Reduce maximum wall tie spacing to

300mm vertically within 225mm from sides of all openings with unbonded

jambs and movement joints. Cavity to be closed at eaves and verge levels in

accordance with robust details. Cavity trays to be installed at abutments with

lower roofs and other structures.

DPC

Polythene DPC min. 150mm above ground level. Vertical DPC's to be provided

to external openings. DPCs to comply with BS8102: 1990. Fill cavity with

concrete up to ground level.

External vertical studwork.

50 x 100mm studwork at 400mm centres with noggins at mid height. Studwork

faced with 12.5mm WPB ply. Studwork packed with Celotex GA4060 insulation

between studs with 40mm gap internally - 40mm Celotex PL4000 fixed to inside

of studwork to give u value of 0.20W/m2K.

Roof insulation

50 x 150 SC16 rafters at 400 centres. Install 120mm celotex XR4120

insulation between rafters with 30mm air gap over - fix 25mm Celotex

PL4000 insulated plasterboard below rafters to give U value of 0.17W/m2K.

- fix over facia ventilators at eaves with equivalent of 25mm continuous slot.

Ridge ventilation. Install ridge vents equal to 5mm continuous slot

Windows and Doors.

SW timber windows to all openings. All windows are to be double-glazed with

16mm air gap and low emisivity glass to give U value of 1.6w/m2K. Ensure

back edges of the frames are set back 30mm from back edge of brickwork outer

leaf. External doors to achieve U value of 1.8w/m2K

Safety Glazing.

Provide safety glazing to all critical areas in windows and doors and sidelights.

Critical areas are between finished floor level and 800mm above for windows

and between floor level and 1500mm above for doors and sidelights.

Lateral Restraint

Provide 5mm x 30mm galvanised ms straps at max. 2m centres along ceiling

and verge levels where roof trusses and floor joists run parallel to external

walls. Straps to be securely fixed to 3 no. trusses / joists and turned down

cavity face of inner leaf of wall min 150mm. Provide sw packing pieces

between trusses / joists and wall and sw noggins between trusses / joists on

line of strap.

Insulation.

Provide fibreglass insulation quilt between roof trusses directly above ceiling to

give a U value not exceeding 0.16w/m2K. This to be achieved by laying

150mm fibreglass between joists with an additional layer of 200mm fibreglass

insulation cross lapped on top.

Roof Ventilation

Provide ventilation in accordance with BS 5250: 1989 and part 2 of the building

regulations. Provide ventilation equivalent to a continuous 25mm slot running the

full length of the eaves. Achieved by using Glidevale SV604 (or similar) soffit vent

and rafter vents between the rafters to ensure air path above roof insulation.

At ridge provide vent tiles equivalent to a continuous 5mm wide strip.

Lintel

to engineer's specsee engineer's calculations

for steel size. Encase in 2 layers of

plasterboard with staggered joints.

Roof Construction.

Clay pantiles to match existing laid in accordance with manufacturers specification, on 38mm x

25mm tanalised softwood battens on air permeable roofing felt to BS 747 fixed over trussed

rafters. Code 5 lead valley on valley boards to LDA details.

Prefabricated gang nail roof trusses manufactured by specialist contractor to BS 5268 Pt 3 1998.

Calculations to be supplied to local authority by contractor prior to the commencement of work.

Trusses to be fixed at 400mm centres with 100mm x 25mm bracing to BS 5268 Pt 3: 1998.

Trusses to bear on 100mm x 75mm sw wall plate strapped to blockwork at max. 2m centres with

30mm x 5mm galvanised straps.

Provide 100mm diam. half round pvc gutters discharging into 64mm diam. pvc downpipes in

positions indicated on plan.

12.5mm plasterboard ceiling to underside of trusses with noggins at joints and perimeters.

see engineer's details for

purlins to centre valley

Mr and Mrs M Marcantonio

67 The AvenuesNorwich

2 Storey Extension - sections

21 01 15 1:50 1:100

K J COLE BA (hons) ARCH DIP.TP MRTPI

43 Park Lane

NorwichNR2 3EF

Tel 01603 491416

Fax 01603 491416kjc@kcole.co.uk

Client

Drawing Title

Date Scale Ref

Job No . Drawing No. Rev

15/394 BR02