Insulating pipes and ducts

The insulation of pipes and ducts is essential to minimise heat losses for heated systems and heat gains for cooled systems. For cooled systems, it is also important to ensure that the risk of condensation is adequately controlled. Guidance on controlling condensation is also provided in this Part L Rockwool guide. This document is a support document to our publication ‘Approved Document L 2013 Edition (England) An Introduction to the Changes’ which is available from our website.

part L - Insulating pipes and ducts The new Approved Documents ADL1 and ADL2 rely on ‘second-tier’ documents published by the department for Communities and Local Government (CLG) to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. The Part L second-tier documents for pipe and duct insulation ADL2 - Buildings other than dwellings The ‘Domestic Building Services Compliance Guide, 2013 Edition’, provides guidance on the means of complying with requirements for space heating systems and hot water systems in new and existing domestic...

Domestic heating compliance

Approved Documents ADL1A and ADL1B rely on ‘second tier’ documents to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. The Domestic Building Services Compliance Guide (2013 Edition) is a second tier document providing guidance on the means of complying with the requirements for space heating systems and hot water systems. Minimum provisions for insulation of pipes The minimum provisions shown below for the insulation of pipes are repeated in the Domestic Domestic Building Services Compliance Guide (2013 Edition) for fuel types...

Non-domestic building services compliance guide

Pipework and duct insulation a – direct hot water pipes and low, medium and high temperature heating pipes Approved Documents ADL2A and ADL2B (2013 Edition) rely on ‘second-tier’ documents to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. b – cooled water supply pipes c – heated air ducts, cooled air ducts and dual-purpose heated and cooled air ducts The ‘Non-Domestic Building Services Compliance Guide (2013 Edition)’ is a second-tier document providing guidance on the means of complying with the requirements for space heating...

b. Cooled pipework Cooled pipework should be insulated along its whole length in order to provide the necessary means of limiting heat gain. Control should be maximised and heat gain to uninsulated pipes should only be permitted where the proportion of the cooling load relating to distribution pipework is proven to be less than 5% of total load. In order to demonstrate compliance, the maximum permissible heat gain for different pipe sizes and temperatures, as given in the table below, should not be exceeded. Table 3 - Based on Table 10, BS5422:2009 Maximum permissible heat gain for cooled water...

c. Hot and cooled ducting Ducting should be insulated along its whole length in order to provide the necessary means of limiting heat gains and/or heat losses from ducts. Where ducting may be used for both heating and cooling duties at different periods during its lifecycle, the provisions for chilled ducting should be adopted, since these are the most onerous. The table below indicates the maximum heat gain/loss per unit area required to meet these provisions (heat gains are shown as negative values). As with pipes, additional insulation may be required to provide adequate condensation control....

d. Condensation control: Chilled and cold water pipes Table 5 - Based on Table 8, BS5422:2009 Outside diameter of steel pipe on which insulation has been based (mm) Thickness of ROCKWOOL Rocklap H&V Pipe Section (mm) Temperature of contents +10˚C CALCULATED THICKNESS (mm) Thicknesses given are calculated specifically against the criteria noted in the table. Adopting these thicknesses may not necessarily satisfy other design requirements.

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