Cost

Costings were as follow:

Folio Date invoice Description Amount
1a 30/09/15 43655 Tradefixdirect £62.75
1 07/09/15 09a45000 Travis Perkins £7.04
2 07/09/15 09a44950 Travis Perkins £22.80
3 07/09/15 09a45040 Travis Perkins £44.62
4 07/09/15 09a44990 Travis Perkins £55.18
5 08/09/15 09b50810 Travis Perkins £1,534.60
6 30/09/15 09a47960 Travis Perkins £128.40
7 12/10/15 10a49220 Travis Perkins £23.21
8 24/10/15 10a50770 Travis Perkins £18.00
9 29/10/15 10a51250 Travis Perkins £22.50
10 08/09/15 158087 West End £14.25
11 02/10/15 153536 West End £4.99
12 11/09/15 151124 West End £16.99
13 19/09/15 205991 West End £16.49
14 11/09/15 209858 B&Q £129.77
15 12/09/15 91858 B&Q £8.00
16 16/09/15 94858 B&Q £8.07
17 02/11/15 10209 Wickes £5.27
18 01/11/15 97858 B&Q £18.64
19 23/10/15 17439c Travis Perkins £684.90
20 23/10/15 17435c Travis Perkins £1,275.12
21 23/10/15 17453c Travis Perkins £72.00
22 23/10/15 17442c Travis Perkins £504.00
23 08/10/15 18562 The Tool People £7.20
24 04/11/15 cash Toolstation £3.81
25 10/11/15 cash Toolstation £8.11
26 16/11/15 cash Toolstation £2.07
27 03/12/15 12600 J H Glass £1,290.00
27a 01/12/16 cash Travis Perkins £636.69
28 19/01/16 12675 J H Glass £1,715.00
29 11/09/15 cash West End £12.00
30 16/11/15 cash Wickes £33.54
31 16/02/16 cash Wickes £4.89
32 23/11/15 cash Wickes £11.33
33 22/02/16 cash Wickes £7.68
34 25/01/16 cash Wickes £20.24
35 15/02/16 cash Wickes £16.77
36 10/11/15 cash Wickes £26.31
37 18/12/15 cash Wickes £19.99
38 20/03/16 cash Wickes £11.80
39 25/03/16 03a39050 Travis Perkins £49.82
40 03/05/16 20063 The Tool People £46.20
41 08/05/16 cash Wickes £48.94
42 04/04/16 cash Wickes £7.95
43 21/04/16 cash Wickes £47.45
44 24/03/16 cash Wickes £10.38
45 09/04/16 cash Wickes £63.14
46 29/02/16 cash Wickes £5.97
47 18/05/16 cash Wickes £11.56
48 06/08/16 cash Wickes -£10.99
49 02/07/06 cash Wickes £54.99
50 23/07/16 cash Wickes £19.76
51 06/08/16 cash Wickes £123.85
52 28/05/16 cash Wickes £65.57
53 27/07/16 cash Ikea £160.50
54 10/04/16 cash West End £32.98
55 24/04/16 cash West End £28.44
56 10/08/16 274 Martin Brothers £1,360.00
57 10/09/16 cash Ward & Co £299.00
58 20/08/16 cash Ikea £227.00
59 13/06/16 cash Dunelm £43.98
60
61 Total £11,201.51

 

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Making Good

The original framed structure of the east end conservatory was used in its entirety as the basis for the new structure. On inspection, all timber was found to be intact with the exception of the northeast corner, which had sufffered some wet rot from ingresss of water at the window corner.

Rotten Timber Stripped Out

Rotten Timber Stripped Out

All rotten timber was stripped out. The remaining timber was treated and replaced.

Corner Made Good

Corner Made Good

 

 

External Work

After finishing the Roof, The eaves and soffits were installed using 18mm Marine ply and 10mm timber. The marine ply was faced with wall panelling:

Hardwood Fixings for Eaves

Hardwood Fixings for Eaves

Eaves

Eaves

Soffits Added

Soffits Added

Decorative Planking

Decorative Planking

 

Standard Guttering. The downpipe flushes over the path onto the lawn at present. Eventually this will be laid under the path into a French Drain to act as a soakaway into the lawn.

Down Pipe for Guttering

Down Pipe for Guttering

West End Gutter

West End Gutter

Vertical timber strips secured the shiplap cladding at the corners. This can be seen in the west end gutter picture above. The set back from the house building line of the west end wall to avoid the house down pipe can also be seen.

Electrical Work

The Circuit for the extension was designed as a domestic spur from the existing domestic power circuit, running through a 30 amp switched fuse box and a consumer unit with 30mA residual current device.

img_7752

Consumer Unit and Switched Fuse

1.4 lighting circuit and 2.4 power circuit wires were used.

One power ring main was laid with 6 power outlets.img_7770

Two ceiling lights and one external sealed light under the eaves were installed.

img_7753-1

The consumer unit comprised a Lighting circuit, Power circuit , and separate external lighting circuit.

Roof Construction

The Roof is a simple cold eaves rafter construction with 18mm marine ply surface screwed to the rafters. All joins were sealed with flexible non-setting silicon mastic.

Roof joins with sealant

Roof joins with mastic sealant

The Roof lights were set into place, then the whole surface was sealed with roofing felt, all joins being sealed with cold set bitument. Prior to applying the shingles , the rafters were left open for 2 weeks to check for leaks.

Rafters

Rafters with Simpson Ties

 

Joist Hangers and Simpson Ties

Joist Hangers and Simpson Ties

Roofing membrane

Roofing membrane

The shingles were then layed with drainage channels on the high side of the roof lights.

Cedar Shingles

Cedar Shingles

Drainage Channels

Drainage Channels

Insulation was set between the rafters, and an interal vapour barrier placed with aluminium foil. the roof was finished with 5.5 mm hardwood plysheet and 1700 gauge lining paper.

Internal roof and wall insulation

Internal roof and wall insulation

5.5 mm Plywood Ceiling Sheets

5.5 mm Plywood Ceiling Sheets

Insulation Values

Insulation is 200mm of rigid foam with internal vapour barrier giving cold surface eaves and walls, except the East Floor which has 150 mm of insulation.

Walls are faced with 9mm marine ply and the ceiling is faced with 5.5 mm marine ply. All ply surfaces are faced with 2000 or 1700 gauge lining paper, then painted with acryllic emulsion.:

Insulation with Vapour Barrier

Insulation with Vapour Barrier

End Wall and Roof Insulation

End Wall and Roof Insulation

The existing house cavity walls retrofitted with insulation are assumed to have a U-rating of 0.5 W/m2k:

“If you retrofit insulation in cavity walls built between 1970 and 1995, you should achieve a U-rating of 0.5 W/m2k.”

http://www.thegreenage.co.uk/getting-to-grips-with-u-values/

Insulation standards and calculations are taken from:

http://www.rehauanswers.co.uk/Home/EnergyRating

and section 4 of L1B. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/540327/BR__PDF__AD_L1B_2013_with_2016_amendments.pdf

Table 1

4.4 Glazed elements

Windows must equal WER band C or better (1.6 W/m²k )

Doors must equal WER band E or better (1.8 W/m²K with glass centre panes 1.2 W/m2k)

Class A windows and doors were used used (with 1.2 W/m2k.)

Using an Area Weighted U Value calculation, and assuming Section 4.8 applies – “not worse than the original building

Calculate the  surface area of the extension as:

End walls: 3 x 2.5 x2 = 15 sq m (of which 50% clad [7.5 sq m], 50% glazed).

Roof: 20 sq m of which 3.4 sq m is glazed leaving 16.6 sq m clad.

North elevation: 2 x 6  = 12 sq m of which 25% is clad [3 sq m] and 25%  opens.

Floor : 18 sq m.

Assuming a temperature gradient of 24 °C , at 50% humidity with no wind

A double glazed A Class window has a U-value of approx 1.2 W/m2k

For a mixed material building, U should be adjusted by:

U adjustment = 0.8 + 1.2 (Area glazed/Area total) + 0.6 (Area openable/Area total)

to allow for convection and radiation losses

U adjustment = 0.8 + 1.2 (7.5+3.4+9/65) + 0.6 (3/65) W/m2k

U adjustment=1.2 W/m2k for the whole building

U =1/R + convection losses + radiation losses

R = I/λ where I = thickness in M

I for  rigid foam insulation  = 0.2 m

R wood=9, 9 = 0.03/λ, ∴λ wood = 0.03/9 = 0.003

I wood = 0.03 m. R = 9 mK/W, ∴ U wood = 1/9 x 0.03, U= 0.27

 λ For rigid foam insulation = 0.022

 λ For wood = 0.003

(the standard requires I = minimum 0.1 m)

Foil-faced polyisocyanurate rigid panel (pentane expanded ) R = 50 m.K/W(approx)

for 200 mm R = 0.2/0.022, R = 9.09 m.K/W and (0.15/0.022 = 6.75) for the East floor

∴ U walls = 1.2 x (1/9.1) = 0.11 W/m2k.

U floor E = 1.2 x (1/9.1) = 0.11 W/m2k.

U floor W = 1.2 x (1/6.75) = 0.18 W/m2k.

(This  exceeds (U<0.5)the insulation for the original upgraded building of 0.5 so complies with L1B).

Minimum standard requires:

Wall U = 0.28 W/m2k.

Pitched Roof U = 0.18 W/m2k.

Floor U = 0.22 W/m2k.

or a standard of insulation that exceeds that of the existing building.

U for Class A windows and doors = 1.2 W/m2k.

For the roof of 20 sq m , U Value = ([3.4*1.2] + [16.6*0.11])/20  = 0.29 W/m2k.

not accounting for cedar shingles plus 18mm marine ply plus blinds

For the floor of 18 sq m , U Value = ([9*0.11] + [9*0.18])/18  = 0.15 W/m2k.

not accounting for 20 mm floorboards

∴ For the whole building of 65 sq m , U Value = ([20*1.2] + [45*0.11])/65  = 0.44 W/m2k.

Over winter 2015 with >75% humidity, 20 deg Celcius was achieved internally at zero deg Celcius running on the existing 3000 approx btu radiator without curtains.

Thermometer at 20 Degrees Internally

Thermometer at 20 Degrees Internally

Velux with Air Frost

Velux with Air Frost Externally

North Face

North Face

East Wall Internal

East Wall Internal

West wall Internal

West wall Internal