GUIDELINE

Introduction

Standard Construction Details

Trench Foundation (60mm Celotex Insulation) Trench Foundation (45mm Celotex Insulation) Strip Foundation (45mm PIR) Strip Foundation (60mm Celotex Insulation) Raft Foundation Design to Structural Engineers Details (85mm Celotex) Raft Foundation Design to Structural Engineers Details (90mm Celotex) Hit and miss underpinning Details Typical Underpinning Detail Details Solid Ground Floor (75mm Celotex Insulation - Concrete) Solid Ground Floor (100mm Celotex FR5000 Insulation) Solid Ground Floor (75mm Celotex Insulation - Chipboard) Solid Ground Floor (100mm Celotex FF4000 Insulation) Solid Ground Floor (75mm Celotex GA4000 Insulation) Solid Ground Floor (90mm Celotex FR5000 Insulation) Solid Ground Floor (Min 100mm PIR Insulation) Solid Ground Floor (Min 100mm Celotex FF4000) Timber Suspended Floor (140mm Rockwool Flexi) Timber Suspended Floor (110mm Celotex XR4000) Beam and Block floor Details(100mm Celotex FR5000 Insulation) Beam and block floor Details (100mm Celotex FF4000 Insulation) Beam and Block floor Details (Screed) Beam and Block floor Details (Chipboard) Partial Fill Cavity Wall Details (70mm PIR) RIW Cavity Drain R20 (Proprietary Components) Details RIW Cavity Drain R20 (Cavity drain and manufacturing details) Details Full Fill Cavity Wall Details (100mm Rockwool insulation) Full Fill Cavity Wall Details (90mm Rockwool Insulation) Partial Fill Cavity Wall Details (40mm PIR) Floor and Wall junction Details Rendered Partial Fill Cavity Wall Details Full Fill Cavity Wall (135mm Rockwool) Full Fill Cavity Wall (140mm Rockwool) Brick Finish Timber Framed Wall (Celotex FR5000) Rendered Timber Framed Wall (Celotex FR5000) Rendered Timber Framed Wall (Celotex GA4000) Brick Finish Timber Framed Wall (Celotex GA4000) Tile Hung Timber Framed Wall (finish with 12-5 mm plasterboard) Tile Hung Timber Framed Wall (Finish with 3mm Plaster Skim) Rendered Partial Roof Cavity Wall Details Warm Pitched Roof (110mm Celotex XR4000) Pitched Roof (100mm Celotex GA4000 Between Rafters) Warm Flat Roof (140mm Crown-bond Celotex) Warm Flat Roof (150mm Crown-up Celotex) Pitched Roof (40mm FR5000 Under) Pitched Roof (52mm Celotex PL4000) Roof Detail Pitched Roof (300mm Rockwool Twin Roll Between and over ceiling joists) Pitched Roof (100mm Rockwool Between Joists and 170mm Over) Warm Flat Roof (12.5mm Spa Solar Reflective Chippings) Warm Flat Roof Details Cold Flat Roof Details Warm Pitched Roof Details Cold Flat Roof Details (Single ply membrane) Colf Flat Roof (Plasterboard over VCL) Cold flat roof (Celotex FR4000 90mm between and 70mm over) Eaves Detail Details Warm Flat Roof (Flat roof to be singly ply membrane roofing) Roof Details Pitched Roof (25mm FR5000 Under) Chimney Through Roof Details Cold Flat Roof Details (3 Layer felt) Ridge Detail

Introduction

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Introduction

Introduction

This guide to Acceptable Construction Details (ACDs) is intended to help the construction industry achieve the performance standards in the Technical Guidance Document (TGD) to Part L of the Building Regulations 2011- Conservation of Fuel and Energy - Dwellings.

This Guide

This guide focuses on issues concerning thermal bridging and airtightness. The guide is presented in two sections.

Section 1 discusses the general theory of insulation continuity and airtightness in construction. A common approach to the design, construction and testing methodology is considered and suggestions are made for the general improvement of the process.

The use of the Acceptable Construction Details in the context of Technical Guidance Document L is discussed. A checklist identifies the essential information to be considered during design and construction, the layout and use of the ACDs sheets are explained.

Construction detailing can create opportunities for increased design flexibility and overall energy efficiency. The increasing significance of detailing and the principles of enhanced detail performance are discussed and illustrated using an example design specification.

Finally, an overview of "How to achieve good performance in thermal bridging and air infiltration" is presented.

Section 2 of this guide is in seven parts on separate web pages. Section 2 provides large scale indicative detail drawings of thermal insulation and airtightness provisions for specific construction interfaces.

The co-operation of the UK authorities (Department of Communities and Local Government) is gratefully acknowledged in enabling the adaptation of the details in its publication “Limiting thermal bridging and air leakage” for official use in Ireland. The details have been modified and extended to reflect construction practice in Ireland, and have been updated to reflect the current requirements in Building Regulations. The details are accompanied by comments and checklists to assist the Designer and Builder achieve the guidance provided in Technical Guidance Document (TGD) L 2011 Conservation of Fuel and Energy in Dwellings of Part L of the Building Regulations at various stages throughout construction. These checklists will also be of assistance to Building Control Authorities.

Application of Acceptable Construction Details

The guide and the ACDs have mainly been conceived in relation to the construction, alteration and extension of dwellings. They are also valid in non-domestic buildings of similar construction.

Use of the ACDs during construction will enable the builder to demonstrate that provision has been made to eliminate all reasonably avoidable thermal bridges in the insulation layers (so far as the details apply). Further specific guidance is also to be found in the Technical Guidance Documents.

Acknowledgements

The Department would like to thank all those involved in the development of these Acceptable Construction Details.

The Department of the Environment, Community and Local Government would like to acknowledge the following for the use of photographs in this document:

Proclima

Viking House

Moyisover

Irish Agrément Board

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