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Hello Everyone:
I am working in an office building project located in Galicia (Spain). We are carrying out the selection process of the heat pump for the air conditioning of the building. According to ANSI/ASHRAE/IESNA 90.1-2007, this heat pump (>40 kW) must comply the following minimum efficiency requirements:
COP (8.3 ºC db / 6.1 ºC wb): 3.2 (as of 1/1/2010)
COP (-8.3 ºC db / -9.4 ºC wb): 2.0
The heat pump we are evaluating has a COP of 3.5 (8.3 ºC db / 6.1 ºC wb). However, the manufacturer of the heat pump does not have the COP value at -8.3 ºC. They send us a letter explaining that this heat pump doesn’t operate under -7 ºC.
We have analyzed the historic minimum site temperatures, and the minimum recorded temperature is -2.7 ºC, so the heat pump would never work under -7 ºC. Additionally, the manufacturer has given us the COP values at various temperatures. With these data, we obtained an equation that relates COP to temperature. The coefficient of determination (R2) of this equation is 1, and our estimated COP with this equation at -8.3 ºC is 2.2 (above the minimum ASHRAE value). This is the efficiency value which would have the machine assuming it could work at -8.3 ºC.
Thus, could we achieve the ASHRAE requirements compliance taking into account these considerations?
Thanks in advance!

We are working with a project that falls under LEED CS 2009.
We are pursuing credit SSc9 tenant desing & construction guidelines, but as the building is under construction any future commercial interior will fall under V4.
As I see scope has changed a little bit.
How do we proceed? Can we still use our CI 2009 guidelines format or do we have to update to V4.

Thanks in advantage.

There are contradictory studies related to the use of glisofat as a herbicide. Would spraying with a mixture containing 30% glifosat be an aceptable practice?

We are looking for compliant materials for a School project.

Regarding exterior applied products, it seems, that just "applied on site" must be compliant (Adhesives, sealants, coatings, roofing, and waterproofing).

We dont have to show compliance for exterior pavements (EPDM tile) or exterior porch made with wood structure right?

Hi you all,

We have a project which is going to pursue both LEED and BREEAM ES cetifications (BREEAM ES as the spanish adaptation for BREEAM). There are some credits which are almost the same, but some of them are slightly different. We would like to make it easier for our client, and not to specify different criterions for both certifications.
And here is the point in the materials category:
- For BREEAM , ISO 14024 Type I ecolabels (Examples of ecolabel programs: http://www.greenspec.co.uk/ecolabels/) are accepted and contribute towards the credit, but I don't see that for LEED. Anyone knows wheter they may comply under any USGBC approved program?
- Since this type of ecolabel complies with ISO 14024, but it is not listed in the aproved estandards for both EPD or Product- specific declaration: ISO 14025, 14040, 14044, and EN 15804 or ISO 21930, nevertheless I was wondering if this ecolabel may fall under Product Specific since is third party verified and according to ISO (ww.iso.org) the principles of this standard include the following stipulations :
• voluntary
• Compliance with environmentaland other relevant legislation isrequired
• The whole product life cycle must be taken into considerationwhen setting product environmental criteria, e.g. extraction of resources, manufacturing, distribution, use and disposal relating to relevant cross-media environmental indicators.
• Product environmental criteria need to be established to differentiate
environmentally preferableproducts from others in the product category when these differences are significant

Thanks a lot for your help,

I am working for a project in Barcelona which is pursuing LEEDv2009 certification. We are facing a huge difficulty to find suppliers for the FSC certified wood and then we would like to replace it for PFEC certification avaiable in Europe, in order to achieve the credit MRc7 - Certified Wood.

The LEEDv4 has launched an ACP approach that allows projects to use PFEC certification in order to acive the credit for Raw Materials, since this certification complies with ASTM D7612-10.
However, we would like to know if it applies the same way for projects version 2009 under the credit MRc6 Certified Wood, since this credit no longer exists in version 4.

Has anyone have experienced projects from version 2009 that achieved this credit by using 100% PFEC certified wood?

We are trying to find a specific adhesive for PVC pipes.

It should be a "Medium Bodied Rigid PVC Solvent cement for large diameters and elevated temperatures (>35°C)"

Has anyone found a similar product that complies with LEED v4 for emissions and content? It is a usual adhesive for pipes used in most of the construction sites.

We have already found a CONTENT compliant product, but does not have the EMISSIONS test done.

Hello All,

We have a 5-floored building pursuing LEED CS v2009 certification, and also WELL certification. Envelope Cx is required. I assume that this is equivalent to BECx described in the LEED v4 guide (as they both have to follow the same guidelines).

As stated in the Further Explanation section of the LEED v4 credit regarding the envelope Cx, “the type of envelope and size of building will determine what tests are conducted and the equipment required. For example, performing a blower door test to determine the air-tightness of an envelope may be appropriate for a 20,000-square-foot (1 860-square-meter) facility with brick façade and recessed windows. However, this type of test would be impractical for a 500,000-square-foot (46 450-square meter) commercial building with a curtain wall façade (…)”

Our building is aprox. 20 000 square meter, and it has a curtain wall façade.

In your opinion, is it recommended to perform the blower door test? Is it required?

Another question regarding the blower door tests under LEED/WELL certification: is there any infiltration requirement to comply with? We have checked lot of documentation, but no value has arised.

Thanks in advance!

Can we consider the IBR (Institut für Baubiologie in Rosenheim) an approved seal which is compliance with LEED v4 requirement for VOC emissions?

Attached you will find information regarding VOC test using ISO 16000:
http://baubiologie-ibr.de/en/content/have-your-indoor-air-analysed