Dormer Loft Plans - Proposed Loft Plan Scale 1:50 - Construction Notes - Drawing No.: 01R1 of 01

Oct 24, 2026

Proposed loft plan scale drawings outline the layout and services for a dormer loft conversion, including partition walls, insulation build-ups, lighting circuits, and switches/controls across the loft, hallway, landing, and bedroom areas. The document provides construction specifications for floors, internal wall systems, roof insulation and venting, dormer cheeks/front panel details, and dormer flat-roof assembly. It also includes staircase, rainwater drainage, and key compliance and verification notes for dimensions, party walls, and building regulations.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages1

Reading Time3 min

AccessFree to download

Proposed Loft Plan Scale

Construction Notes

Floor Construction

Internal Wall Construction

Dormer Cheeks/Front Panel

Dormer Flat Roof Construction

Staircase

Rainwater

Dimensions and Compliance Notes

Proposed Loft Plan Scale: 1:50 W3. New internal timber Built partintion wall 100mm studs with insulation insterted insulation. 15 Minutes Overrun for adequate ventilation connected to mains C: SW3. 2 Gang Twin DP Outlet 1 SW1 Swith for L1, second switch (SW2) for the same light is located on 1st floor at entrance of new stairs 2 Gang Twin DP Outlet 6 2 Gang Twin DP Outlet 7 L1 Hallway and landing light suspended from ceiling by 100mm max; 2 way switch C: SW1 & SW2 SW3 ~~ ~~Pull switch for bathroom & overrun L2 Bathroom light C: SW3 (cord 100mm away from wall) ~~ ~~ 100mm Celotex Insulation | | | | --- | --- | | | | New floor to be 175 x 50 C16 s/w joists at 400mm c/c spanning between new steel beams |
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| | Existing Party Walls, used for steel supporting base plates, see structural Plan for details,(to be confirmed by BC) Existing Roof Tiles 13mm Vapour checked plasterboard and skim W4. New internal timber Built partintion wall 100mm studs with insulation insterted insulation. Existing Chimney Breast tobe worked around Existing New floor to be 150x50 C16 s/w 400mm c/c spanning between new joists at steel Roof insulation; 100mm rockwool tightly packed 100mm Celotex insulation with 13mm vapour checked plasterboard and skim 100mm Celotex insulation with 13mm vapour checked plasterboard and skim L3 Bedroom light C: SW4 W1. New internal timber Built partintion wall 100mm studs with insulation insterted insulation. 2no. 740x1180mm Velux style centre roof windows. Double up joists around pivot pitched opening Built in Eave Storage 2 Gang Twin DP Outlet 4 with fibre glass insulation over and accross joists ~~ ~~ 3no. SW4,5,6 L4 ~~ ~~ Bedroom light C: SW5 C: L3, L4 & L5 (3 switched to control 3 lights in loft room) W2. New internal timber Built partintion wall 100mm studs with insulation insterted insulation. | Dormer Loft Plans Drawing No.: 01R1 of 01 | | | | --- | --- | --- | | Please note that before building works Commences; it is the responsibility of builders or owner to serve party wall notices to all neighbors.
Dimensions
All dimensions to be checked on site. Contractor to check site thoroughly before work starts and report any discrepancies.
Dimensions stated are for guidance only. Contractor to verify all boundary positions and dimensions on site prior to commencing any work, making workshop drawings or buying any materials.
Note: simple dimension check of the site has been conducted in order to prepare this scale drawing. Proposed designs have been provided by the client and final designs on
this drawing have been approved by the client.
No site supervision is implied or undertaken unless otherwise separately arranged. The drawing does not indicate the extent of any excavation works and the contractor is to determine this prior to submitting a quotation for the works or commencing any works.
The drawing does not indicate or imply the structural condition of the existing property. The drawings have been prepared for assistance in the preparation of details for planning and building regulations purposes only. No check dimensions have been taken.
Construction Notes:
75 x 50mm timber studs at 400mm c/c fixed to existing structural walls with thermal insulation inserted in between studs. Lined
with 13mm vapour checked plasterboard
Dormer Cheeks/Front Panel
Tiles to compliment existing. Tiles fixed to 40x25mm timber battens with breathable membrane beneath. Battens to be fixed to vapour control layer, fixed to 100x50 s/w studs at 400mm c/c insulated with 83mm rockwool and 17mm air gap. Finished internally with min: 10mm vapour checked plasterboard and skimmed.
Code 5 lead flashing to tile/roof junction
Existing Front Roof Pitch
Repair/Replace tiles where necessary. Double up existing rafters insulated with 70mm rockwool and 30mm ai

FAQs

What is the proposed scale used in the loft plan drawing?

The plan states “Proposed Loft Plan Scale: 1:50”.

What materials and thicknesses are specified for the internal wall construction?

New internal stud walls use 100x50mm studs with 100mm Rockwool, finished with 13mm plasterboard on each side and 5mm plaster skim; plasterboard joints are to be taped, with 30 mins fire-rated plasterboard to the stair enclosure.

What roof and insulation build-ups are described for the dormer flat roof and roof junctions?

The dormer flat roof uses three-ply built-up waterproof coverings over 50x150mm rafters with specified span limits, with 100mm insulation packed between rafters and an air gap arrangement; 13mm foilback plasterboard is finished with 5mm plaster skim. For the dormer cheeks/front panel, Code 5 lead flashing is specified at the tile/roof junction.

Oct 24, 2026

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