Generally speaking, we require a regular set of architectural plans for our assessment. So whatever is normally being provided on the plans is sufficient in the majority of projects. We require site plan, all the floor plans, elevations and, when evailable, sections of the project.
The following information are required to be on the plans:
According to NatHERS thermal comfort protocol, assessors are obligated to model only the projects which show the dimensions and opening type of all the windows of each dwelling. This requires the designers to provide that information either on the plans or in form of a windows schedule. We require windows dimensions (Height X Width) and opening type (Fixed, Sliding, Awning, etc) before we can start the NatHERS thermal modeling. The mothod of showing this information is entirely up to the decision and preferences of the design team.
The simplest and also the most effective way of showing this information is by providing a single line of text on the floor plans beside each window. Below picture gives you an example of this approach.
Below you can find easy to complete online forms which enable you to send us all the complementary information that we require for preparation of a NatHERS assessment and / or BASIX certificate. If your development have more than one category of dwellings in it (For example, you have both town houses and units in a single project) please use the one which is to the right side of the list below (In this example, the multi unit checklist)
The thermal comfort component in the BASIX NatHERS certification service exists to make sure the occupants of a building experiencing the most comfortable and healthy environmental conditions of their house while the economy and practicality of the construction are also considered.
By including this in energy efficiency targets, greenhouse gas emissions are reduced along with better management of existing infrastructure used for heating and cooling requirements of individual houses.
A thermal comfort assessment can be done in two ways:
The DIY Method means that you would need to commit to minimum insulation levels and select glazing and shading that will ensure that the estimated heating and cooling loads do not exceed the maximum loads, per BASIX requirements.
These heating and cooling loads are based on the Nationwide House Energy Rating Scheme (NatHERS) climate zone, the windows, shading and (if any) proposed skylights to your development.
However, the DIY method can only be used if the following preconditions are met:
There are a significant number of limitations if you choose the DIY option, especially for a larger house - as only certain types of shading are available and overshadowing is only counted if it is directly in front of the centre, at the base of the glazing.
This is why the simulation method, conducted by an assessor will always provide the most accurate results, factoring these outcomes in.
If you have time to read 14 pages, you can just check out the PDF guide to certifying thermal comfort or if you're busy with work today like us, read the summary and steps below:
The maximum heating and cooling loads in assessing the thermal comfort of a dwelling is based on the climate zone in which the development zone is under. These are determined individually in perspective of this, and good performance of heating/cooling alone will not be undermined by poor performance in the other.
You can find the heating and cooling caps as of July 2017 here.
If the heating load is significantly higher than the heating load cap, then you can consider reducing the heating loading in the following ways: