Pitched roof, rooms within the void.

Question

Hi there, 
 I am new to hevacomp. I am creating a building that has a ground floor height of 4.3m, and a first floor height of 4.3m. 
 The problem I am having is that the first floor rooms are within the roof void, therefore there is only 0.5m of external wall for the first floor before the pitched roof begins, so what height would I set the first floor to? 
 Also, would hevacomp recognise that the internal partitions on the first floor are not to the full 4.3m height as the roof is pitched and would therefore taper off flush with the roof height? 
 Any clarification on these points would be great thank you. 
 
 Regards 
 Kieran

Shane Regan · Accepted Answer

Hi Kieran, 
 This will all be taken into account when you set up your roof. 
 I would suggest drawing your first floor rooms 4.3m high. Once complete, you should go to Roof/floors and add your roof by clicking on Add Roof section , and then use the Elevate point and Elevate Edge options to create the pitch, e.g.: 
 
 Once your roof is finished, click on the Set up roofs tab. Tick the Extend walls to underside of roof option and correct room volumes , and then click Set up exposed roofs: 
 
 This will correct wall heights, partition heights, and room volumes. I would also suggest having a look through the CAD Input section of the Design Database manual as the above is covered in greater detail and may be helpful to you - e.g.: 
 If you check the Extend walls to underside of roof and correct room volumes check box, the program will examine the intersection of every wall and partition with the roof sections over the room. Each wall section will be extended, if necessary, so that it fits neatly to the under-side of the roof, even if this results in a complex wall profile. The program will then allow for the wall profile for heat flow by changing the mean wall height and the actual wall profile will be used when drawing the wall in 3D. The program will also adjust the room volume, to allow for the volume under the roof elements. If you use this feature it is assumed that rooms open out into the roof and that the under-side of the roof (apart from any false ceiling) is visible from rooms. If you do not use this feature, you should ensure that your 3D roof drawing includes vertical sections to fill gable ends etc. 
 Please get in touch should you have any other questions.