SiteBrief — Detail Library

Roof 2 ready · 10 planned · swipe →

ROOF-EAVES-01

Free — Preview

⚠ 2 SE req.

Eaves detail — cold roof

Masonry cavity wall — natural slate — insulation at ceiling — cold roof ventilated

Cold roofNatural slateBS 5534

⚠ 2 structural requirements on this detail

L03-RF-RIDGE-01

Free — Preview

⚠ 2 SE req.

Apex / Ridge detail

Traditional slate roof — mitred ridge tile — mortar bedded — BS 5534 compliant

Traditional cut roofNatural slateRidge

⚠ 2 structural requirements on this detail

— PLANNED —

Reno

Hip detail

Slate, tile — three corner variants

Coming soon

— PLANNED —

Reno

Verge detail

Dry verge, mortar, undercloak

Coming soon

— PLANNED —

Pro

Velux pitched

Flashing kit, weatherproofing

Coming soon

— PLANNED —

Pro

Chimney flashing

Lead apron, soakers, back gutter

Coming soon

— PLANNED —

Pro

SVP through roof

Lead slate, vent pipe

Coming soon

— PLANNED —

Pro

Solar panel mount

Penetration through underlay

Coming soon

— PLANNED —

Elite

Dormer cheek

Lead, hung tile, slate cheek

Coming soon

— PLANNED —

Elite

Box gutter / parapet

Failure zone — three variants

Coming soon

— PLANNED —

Elite

Green roof / sedum

Three sub-variants by saturation

Coming soon

— PLANNED —

Elite

Conservation rooflight

Flush-fit, listed buildings

Coming soon

First floor 3 ready · 8 planned · swipe →

FLOOR-INT-02

Reno

⚠ 3 SE req.

Timber intermediate floor

Masonry cavity wall — timber joists on hangers — Part E acoustic compliance

ResidentialPart EAcoustic

⚠ 3 structural requirements on this detail

L02-RF-FLAT-01

Reno

⚠ 3 SE req.

Flat roof — masonry abutment

Single ply membrane — timber firings — galvanised flashing chased into brickwork

Flat roofSingle plyMasonry abutment

⚠ 3 structural requirements on this detail

ROOF-FLAT-02

Pro

⚠ 2 SE req.

Flat roof rooflight detail

Single ply membrane — insulated upstand — doubled timber joists at opening

RooflightFlat roofOpening

⚠ 2 structural requirements on this detail

— PLANNED —

Pro

Knock-through opening

Steel beam, padstones, masonry above

Coming soon

— PLANNED —

Elite

Steel beam — timber pocket

M10 bolts, two configurations

Coming soon

— PLANNED —

Pro

Concrete intermediate floor

Beam & block, screed

Coming soon

— PLANNED —

Pro

Acoustic floor — Part E

Floating floor, resilient bars

Coming soon

— PLANNED —

Reno

Trimmed opening

For stairs, Velux, services

Coming soon

— PLANNED —

Elite

Balcony threshold

Waterproofing + insulation stack

Coming soon

— PLANNED —

Pro

Floor cassette

Modern construction

Coming soon

— PLANNED —

Elite

Steel column connection

Moment connection, base plate

Coming soon

Walls 12 planned · swipe →

— PLANNED —

Reno

Cavity tray + weep

Over openings, abutments

Coming soon

— PLANNED —

Reno

Cavity closer — jamb

Fire stop, thermal bridge

Coming soon

— PLANNED —

Reno

Cavity closer — head

Above openings

Coming soon

— PLANNED —

Reno

Cavity closer — cill

Below openings

Coming soon

— PLANNED —

Reno

Lintel — concrete

Standard openings

Coming soon

— PLANNED —

Pro

Lintel — steel cat slide

Wide cavity, thermal break

Coming soon

— PLANNED —

Reno

Restraint strap

Building Control flag — gable wall

Coming soon

— PLANNED —

Reno

Wall plate strap

Galvanised, 2.4m centres

Coming soon

— PLANNED —

Pro

Movement joint

Long brickwork runs over 12m

Coming soon

— PLANNED —

Elite

Air-tightness junction

Corner, opening, service entry

Coming soon

— PLANNED —

Elite

Ventilated render

Cob, stone, listed buildings

Coming soon

— PLANNED —

Elite

Lime mortar pointing

Penny-struck, flush, ribbon

Coming soon

Ground floor 7 planned · swipe →

— PLANNED —

Reno

Door threshold — DPC

Front door, Part M accessibility

Coming soon

— PLANNED —

Pro

Bifold threshold

Linear drain, weatherproofing

Coming soon

— PLANNED —

Reno

Window cill detail

Stone, brick, GRP

Coming soon

— PLANNED —

Reno

Internal partition cleat

Non-loadbearing to truss

Coming soon

— PLANNED —

Elite

Sash window reinstatement

Weight pocket, parting bead

Coming soon

— PLANNED —

Pro

Heat pump cavity entry

Pipework gland, thermal break

Coming soon

— PLANNED —

Pro

EV charger gland

Through cavity, fire-stopped

Coming soon

Foundation 1 ready · 8 planned · swipe →

L00-CN-FDNTS-01

Pro

⚠ 4 SE req.

Perimeter foundation detail

Full fill cavity wall — trench strip foundation — insulation below slab

New buildExtensionGround floor

⚠ 4 structural requirements on this detail

— PLANNED —

Pro

Stepped foundation

Sloping sites, retaining wall tie

Coming soon

— PLANNED —

Elite

Underpinning — pin & core

Mass concrete, retrofit

Coming soon

— PLANNED —

Elite

Pile cap with tie beam

Clay shrinkage, NHBC tree zone

Coming soon

— PLANNED —

Pro

Raft foundation

Poor ground, mining areas

Coming soon

— PLANNED —

Pro

Existing foundation tie-in

New extension to existing

Coming soon

— PLANNED —

Elite

Basement — Type A

Barrier waterproofing

Coming soon

— PLANNED —

Elite

Basement — Type B

Structural integral

Coming soon

— PLANNED —

Elite

Basement — Type C

Drained cavity drainage

Coming soon

Drainage 8 planned · swipe →

— PLANNED —

Reno

Bottle gulley

Downpipe to below-ground

Coming soon

— PLANNED —

Pro

Linear drain — bifold

At threshold, key bifold detail

Coming soon

— PLANNED —

Pro

Manhole detail

Buildable depth, cover types

Coming soon

— PLANNED —

Pro

SVP below-ground bend

Rest bend, branch connections

Coming soon

— PLANNED —

Pro

Soakaway — SUDS

Sized to roof area

Coming soon

— PLANNED —

Pro

French drain

Retaining wall, rainwater

Coming soon

— PLANNED —

Elite

Rainwater harvesting

Tank, first-flush diverter

Coming soon

— PLANNED —

Reno

Inspection chamber

Brick, plastic

Coming soon

CONC-FDNTS-01

Perimeter foundation detail

New buildExtensionGround floor4 SE requirements

⚠ Illustrative detail only. Dimensions and material grades have been omitted to preserve liability. Do not scale, do not construct, and do not undertake work based on this drawing without consultation from a qualified structural engineer. All works must comply with current Building Regulations and British Standards. Detail current as of March 2026.

Build-up layers

Facing brickwork

Class B engineering bricks below DPC

Full fill mineral wool cavity insulation

BBA certified — sheltered/moderate exposure only

Load bearing blockwork inner leaf SE

SE to specify block strength class

Stainless steel cavity wall tie

Type and spacing per PD 6697

Trench fill strip foundation SE

Concrete mix to SE specification — SE to specify width and depth

Reinforced concrete ground bearing slab SE

SE to specify thickness and mesh

Rigid PIR insulation below slab

To achieve U-value to SE/SAP specification target

DPM on sand blinding

Heavy duty polythene DPM — lapped and sealed at all joints

Perimeter insulation upstand SE

Prevents thermal bridging at slab edge — SE to confirm

⚠ Structural requirements — 4 items require SE input

⚠Foundation depth — SE to specify per ground conditions

⚠Reinforcement specification — SE design required

⚠Trench fill concrete mix — SE to specify

⚠Slab reinforcement — SE to confirm mesh or RC

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: Agree top of concrete level with your engineer before the pour — brickwork courses to DPC must be coordinated.

🟡 Watch out: Trees on clay sites — foundation depth may need to increase significantly. Check NHBC 4.2 before setting out.

🔵 Why it matters: Made ground at formation — stop and call the SE. Never concrete over unknown fill material.

Recommended products — tiered by specification

EssentialAncon SDB-D Stainless Wall Ties (pack)Screwfix

Tier 1Rockwool Full Fill Cavity Slab (depth per SE spec)Toolstation

Premium+Kingspan Kooltherm K103 Floorboard (depth per SAP calc)Travis Perkins

FLOOR-INT-02

Timber intermediate floor

ResidentialPart EAcoustic3 SE requirements

Build-up layers

T&G floor boarding

Moisture resistant grade — structural ply or equivalent

Mineral wool between joists

Acoustic performance — Part E compliance

Timber floor joists SE

SE or TRADA span tables — size per span and loading

Joist hanger + resin fixed bearer plate SE

SE to specify fixing — resin anchors to masonry leaf

Plasterboard ceiling

Taped and jointed — Part E robust detail

PIR insulation dot and dab

To internal face of external wall — thermal performance to SE/SAP spec

Stainless steel cavity wall tie

Type and spacing per PD 6697

⚠ Structural requirements — 3 items require SE input

⚠Joist sizing and span — SE or TRADA span tables required

⚠Joist hanger specification — SE to confirm connection type

⚠Resin anchor specification for timber bearer plate — SE design

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: Joist hangers at every bearing — never rely on built-in ends. Shrinkage causes squeaks and settlement.

🟡 Watch out: Part E — harder floor finishes need resilient strips between joists and boarding to maintain compliance.

🔵 Why it matters: Acoustic flanking paths destroy Part E. Ensure service void battens are isolated from structure.

Recommended products — tiered by specification

EssentialJoist Hanger Single Galvanised (pack of 10)Screwfix

Tier 1Rockwool Flexi Slab (pack — size per SE spec)Toolstation

Premium+Novia Gold Acoustic Membrane 50m rollTravis Perkins

ROOF-EAVES-01

Eaves detail — cold roof

Cold roofNatural slateBS 55342 SE requirements

Build-up layers

Natural slate tile

BS 5534 Part 1 — nailed to treated battens at correct gauge

Treated timber battens

Gauge per BS 5534 and pitch — size to SE/manufacturer spec

Breathable high resistance underlay

Wide overlay band at ridge — draped to gutter

Timber rafters SE

SE or TRADA span tables — birdsmouth max 1/3 depth

Cross ventilation zone — min clearance per ADoc C

Proprietary cross flow ventilator — Minimum clear air gap per ADoc C

PIR insulation at ceiling level

U-value to SE/SAP specification — between and over ceiling joists

Vapour control layer

Below insulation — taped at all laps

Plasterboard ceiling

Taped and jointed — painted finish

Wall plate + holding down strap SE

DPC below wall plate — fixings to SE spec

Ventilated soffit

10,000mm² per m run minimum

⚠ Structural requirements — 2 items require SE input

⚠Wall plate holding down strap — fixings to SE specification

⚠Cavity barrier fire resistance — SE or fire engineer to confirm spec

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: Rigid eaves vent tray every rafter bay — clips before insulation. Guarantees required air path regardless of insulation thickness.

🟡 Watch out: Birdsmouth max 1/3 rafter depth. Over-cutting creates stress concentration that splits under snow load.

🔵 Why it matters: Blocked ventilation gap = condensation on timber = rot. You will not see the damage for 5-10 years.

Recommended products — tiered by specification

EssentialCatnic Eaves Ventilation Tray 1200mm x10Screwfix

Tier 1Marley Cloaked Verge System natural slateToolstation

Premium+Cromar Pro-Slate High Resistance Underlay 50mTravis Perkins

ROOF-RIDGE-01

Apex / Ridge detail

Traditional cut roofNatural slateRidge2 SE requirements

Build-up layers

Ridge tile bedded and jointed in mortar

Mechanical fix also required per BS 5534:2014

Wide overlay band — high resistance underlay

Overlaps main underlay both sides at ridge apex

Breathable high resistance underlay

Continuous from eaves to ridge — no gaps

Natural slate — top and shoulder courses

Maintain gauge — fix per manufacturer instruction

Timber ridge beam SE

SE to specify section size and connections

Timber rafters SE

SE or TRADA span tables — opposing pairs at ridge

PIR insulation at ceiling level

U-value to SE/SAP specification target — over and between ceiling joists

Vent position and number

Dependent on roof area, airtightness, insulation type

⚠ Structural requirements — 2 items require SE input

⚠Ridge beam sizing — SE specification required

⚠Rafter sizing and spacing — SE or TRADA tables required

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: BS 5534:2014 requires mechanical fixing of ridge tiles. Mortar alone is no longer compliant. Specify dry ridge or clips as standard.

🟡 Watch out: Ridge board is non-structural. Remove ceiling joists without an engineered tie and the roof will spread outward.

🔵 Why it matters: Mortar ridge failure is the most common UK roofing maintenance issue. Wind uplift begins years before visible cracking.

Recommended products — tiered by specification

EssentialRedland Dry Ridge System Universal 6m kitScrewfix

Tier 1Marley Dry Ridge Roll Ventilated 5mToolstation

Premium+Sandtoft Dry Ridge Complete Kit FarmhouseTravis Perkins

ROOF-FLAT-01

Flat roof — masonry abutment

Flat roofSingle plyMasonry abutment3 SE requirements

Build-up layers

Single ply roof membrane

Draped over and down upstand — minimum height per manufacturer specification

Insulated upstand

Continuity of insulation at wall junction — U-value to SE/SAP specification

Galvanised flashing

Chased into brickwork — mortar re-pointed — weatherproof sealant

Timber roof joists SE

SE to specify size and spacing per span and loading

Timber board fixed to firings

Provides deck for membrane — structural grade OSB or ply — thickness to SE spec

Timber firings — laid to falls SE

Minimum fall to outlet — SE to confirm drainage adequacy

Rigid PIR insulation

U-value to SE/SAP specification — warm deck above joists

Joist hangers + resin anchors to masonry SE

SE connection design — stainless in external locations

⚠ Structural requirements — 3 items require SE input

⚠Timber joist sizing — SE specification required

⚠Joist hanger and resin anchor — SE connection design required

⚠Timber firings layout for drainage falls — SE to confirm structural adequacy

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: Minimum falls required — tapered insulation preferred over site-cut firings. Supplier provides free layout drawings from your plan and outlet positions.

🟡 Watch out: Upstand minimum height from finished surface — not deck level. Measure before membrane is dressed.

🔵 Why it matters: Ponding water accelerates membrane degradation. Any standing water 48hrs after rain is a defect.

Recommended products — tiered by specification

EssentialSika Sarnafil Single Ply MembraneScrewfix

Tier 1Kingspan Kooltherm Floorboard (depth per SAP calc)Toolstation

Premium+Alumasc Skyline Aluminium Parapet TrimTravis Perkins

ROOF-FLAT-02

Flat roof rooflight detail

RooflightFlat roofOpening2 SE requirements

Build-up layers

Single ply roof membrane

Draped over upstand — minimum height above finished roof level per manufacturer specification

Upstand — insulated internally

Continuity of insulation — internal finishes to upstand

Timber roof joists — doubled at opening SE

SE to specify where joists are cut and trimmed around opening

Timber board on firings to falls

Falls directed away from rooflight to perimeter outlet

Rigid PIR insulation

To achieve required U-value — warm deck above joist level — per SAP calc

Minimum height upstand

Measured from finished roof surface — not deck level

⚠ Structural requirements — 2 items require SE input

⚠Doubled or tripled timber joists around opening — SE to specify

⚠Upstand kerb structural specification — SE design for larger rooflights

Desktop study available from £225

Key parameters

Exposure zone

Insulation spec

Cavity width

Tips

🟢 Pro tip: Double or triple joists at all four sides of the opening — not just the two trimmer sides. Full perimeter enhancement required — SE to specify.

🟡 Watch out: Upstand height is measured from the finished roof surface — not the deck. Allow for insulation and any paving build-up.

🔵 Why it matters: Rooflight upstands below 150mm are the most common source of flat roof water ingress. Most frequently missed on NHBC inspection.

Recommended products — tiered by specification

EssentialVelux Fixed Flat Roof WindowScrewfix

Tier 1Fakro DXW Fixed Flat Roof WindowToolstation

Premium+Vision AGI Bespoke Rooflight triple glazedTravis Perkins

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