The Leiden roof dossiers
40 terms from A to Z. Understand a roof report, distinguish between layers and ask a more precise follow-up question.
All topics shown.
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Concealed gutter
A concealed gutter is a less directly visible gutter-like provision at a roof junction, for example beside a rising building component. Its arrangement var
Open the dossierCondensation
Condensation is the change of water vapour into liquid water under suitable conditions. It may be relevant to moisture questions in buildings, but a visibl
Open the dossierCounter-batten
A counter-batten is a batten occupying a different direction or position from tile battens within the roof build-up, helping organise the layered support a
Open the dossierE
Eaves gutter
An eaves gutter is a channel along a roof edge collecting water from the roof and directing it towards an outlet. Its name does not establish material, sup
Open the dossierEmergency overflow
An emergency overflow is a provision with an additional drainage role within a designed roof-drainage system. It is not equivalent to ordinary rainwater dr
Open the dossierEPDM
EPDM is a synthetic rubber used in products including roof waterproofing. The abbreviation identifies a material family, not one universal roof assembly. D
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Rainwater drainage
Rainwater drainage is the provision or route carrying rainwater away from a roof. In conversation, it may mean a roof outlet, downpipe or larger connected
Open the dossierRepair plan
A repair plan describes how an established or further investigated defect will be addressed within an identifiable work boundary. It connects findings with
Open the dossierRidge tile
A ridge tile is a shaped capping element used at the ridge or a similar transition on a tiled roof. The visible element belongs to a broader junction conta
Open the dossierRoof ballast
Roof ballast is material whose weight performs a function within a selected roof or equipment system. It may form a designed layer or support arrangement.
Open the dossierRoof cove
A roof cove is the internal corner where a horizontal or sloping surface meets a rising component. It is a relevant zone for the transition of waterproofin
Open the dossierRoof covering
Roof covering is the outer covering layer or set of components finishing the roof, such as tiles or a membrane. Its name does not establish the complete ro
Open the dossierRoof decking
Roof decking is the boarding or sheathing layer forming part of the underlying roof construction. Different sheet or board materials may be present. The te
Open the dossierRoof dossier
A roof dossier is an organised collection of roof information, including drawings, reports, investigation findings and completed work. Its purpose is to ke
Open the dossierRoof edge
A roof edge is the boundary of a roof plane and often contains several interacting components. Visible finishing, underlying fixing and the connection to t
Open the dossierRoof edge trim
Roof edge trim is a profile used to finish a roof perimeter. The visible profile interacts with the covering and other edge components. Its name does not a
Open the dossierRoof falls
Roof falls are the intended gradients directing water across a surface towards a chosen route. On a roof, that direction relates to drainage and junctions.
Open the dossierRoof inspection
A roof inspection is a bounded assessment of roof components. Its contents depend on the investigation question, access and agreed method. The word inspect
Open the dossierRoof insulation
Roof insulation is an insulating layer or provision within the roof construction, forming part of the building’s thermal envelope. Suitable execution relat
Open the dossierRoof junction detail
A roof junction detail describes how different components or layers meet. Examples include transitions to a wall, outlet or penetration. The condition of t
Open the dossierRoof penetration
A roof penetration is a location where a pipe, duct or other component passes through the roof assembly. The connected system’s purpose and its waterproof
Open the dossierRoof plane
A roof plane is an identifiable part of the roof surface, bounded by edges, a ridge or adjoining building components. The term helps divide a large roof in
Open the dossierRoof ridge
A roof ridge is the upper line where sloping roof planes meet. It is both a geometric location and a transition containing its own components. The ridge is
Open the dossierRoof seam
A roof seam is a connection or transition between sections of covering or junction material. Its arrangement depends on the selected product and system. A
Open the dossierRoof tile
A roof tile is an individual covering element within a tiled roof. Tiles work together in a pattern of overlaps and connections. Assessing one tile therefo
Open the dossierRoof underlay
Roof underlay is a layer or provision beneath the visible covering that performs an additional role within the roof system. Arrangements differ, so the wor
Open the dossierRoof upstand
A roof upstand is a raised component beside a roof plane where waterproofing connects or continues upwards. Upstands occur at different building elements.
Open the dossierRoof valley
A roof valley lies at the inward meeting of two sloping roof planes and forms part of their drainage route. Its geometry differs from an eaves gutter along
Open the dossierRoot-resistant layer
A root-resistant layer is a component intended to resist root penetration within a roof assembly. That function can be system- or product-specific. Ordinar
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Thermal bridge
A thermal bridge is a location in the building envelope where heat transfer differs from the surrounding construction, for example at an interruption or tr
Open the dossierTile batten
A tile batten is a batten within a tiled-roof assembly that supports or receives the tiles. Position and spacing relate to the selected tile profile and ac
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Vapour control layer
A vapour control layer limits water-vapour movement within a designed construction. Its role differs from that of the external waterproof covering. Appropr
Open the dossierVentilation space
A ventilation space is a cavity serving a ventilation role within a selected construction. For a roof, identify the space concerned and its relationship wi
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