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…and the insulation is perfect: a Lothar Moll presentation on physics, ecology and building enclosures – making high performance safely

September 15, 2013
Lothar Moll Pic

Lothar Moll

Meet Lothar Moll, the founder and CEO of Pro Clima, the world leader in complete ecological airtightness and vapor control systems.

Lothar will make a series of expert presentations from Boston to Washington DC.  Lothar will present how to build safe, healthy and durable constructions that maximize energy savings, minimize the risk of damage to the structure and prevent mold and rot for wood framed and masonry retrofit assemblies with in-depth discussion of building physics, including WUFI analysis and assembly options specific to our climates in New England, New York, and Mid-Atlantic regions.

Oct 21, 5:30-8pm:  Boston Public Library, 700 Boylston Street. RSVP by email:  info@foursevenfive.ca
Oct 23, 9am-12pm: Brooklyn, NY, 475 HQ.  RSVP by email:  info@foursevenfive.ca
Oct 23, 6-8pm: New York, NY, Trespa Design Center.  RSVP here.
Oct 24, 11:30am-1pm: AIA Baltimore Gallery, 11 1/2 Chase Street. (followed by project site visit to Baltimore Green for Everyone development project) RSVP by email at baltimoreCOTE@gmail.com
Oct 24, 6-8pm: Washington DC, Intus Showroom.  RSVP here.
Oct 25, 2-5pm: Philadelphia Center for Architecture.  RSVP by email:  info@foursevenfive.ca

If you are working on low-energy buildings, new and/or retrofit, don’t miss this opportunity to discuss your questions with pioneer and leader, Lothar Moll.  (bio below)

Inboard airtightness. 

The presentation will show how airtight construction on warm side of the insulation and vapor variability of that layer are key to achieving these goals and allow you to optimizing these high performance structures with first-class membranes, air-sealing tapes and airtight accessories.


WUFI illustration

Lothar’s WUFI calculations will investigate specific challenging wall and roof constructions of new buildings in the climate conditions of the New England, New York City metro and Mid-Atlantic regions – how specific approaches lead to different degrees of safety in structures and which assemblies will give the most assurance for safe and durable construction.

Masonry high performance retrofits.

He will address retrofit solutions for masonry buildings in the same climates and the issues commonly found in retrofit situations when interior insulation is added. Again WUFI calculations for retrofits, are used to show that in renovation of historic masonry structures depend on execution, assembly build-up  and materials used for the best performance in the buildings’ next phase of use.

Exterior wind and airtightness.

Wall WRB (housewraps) and roof underlayments are supposed to facilitate outward drying in the cold seasons in heating climates (zone 4 and higher), but of course only after they have successfully been able to keep the building envelope dry.

The mechanisms of interior moisture transport through roof and wall happen by diffusion and convection, while drying to the exterior only occurs by diffusion. Making a building waterproof while not degrading its drying potential depends on materials composition and enclosure assembly build-up. The presentation will show why nonporous vapor permeable materials make a significant difference when compared to (micro-)porous membranes and how this difference is apparent both in lab and real life situations.

How to connect airsealing and vapor control layers.

Which details and elements make wall and roof wind and airtight systems perform optimally and for the long term?  Solutions will be demonstrated to show how different materials are connected with the appropriate materials. This is important as certain materials expand and contract through the seasons (wood) while others (for instance concrete) show much less of such movement. The connections need to be able to withstand these movements and also be able to cope with elevated moisture conditions from construction activities (compounding drywall, tiling, concrete work).

A complete approach.

The results of both interior and exterior sealing systems are envelopes that can be both highly insulative and provide the maximum drying reserve possible.  Pro Clima helps simplify building component integration and ensure success with systems that are airtight and moisture-regulating: intelligent high performance vapor retarders, diffusion open exterior wall and sub-roof membranes, durable tapes, special adhesives, penetration gaskets, and other special accessories.

Email us at info@foursevenfive.ca for complete schedule details and to reserve your spot.

Lothar Moll Biography:

Lothar Moll at PH Conf Hannover

Lothar Moll at International Passive House Conference, 2012

With a degree in Engineering Wood Technology Study and Industrial Engineering, Lothar Moll established MOLL bauökologische Produkte GmbH, an environmentally focused building product business, in 1979.   As part of Lothar’s deep commitment to the environment and building progress, he helped found the Institute of Building Biology + Ecology Neubeuern (IBN), the first information office about ecological building methods.  Lothar became a pioneer of the biological and ecological construction movement in Germany and played a significant role in the development and corporate direction of the building sector.

In 1986 Lothar developed the first ecological airtightness system, which was upgraded in 1991 with the first humidity-variable (Intelligent) vapor check – this was later endorsed by The Fraunhofer Institute of Building Physics in 1994.


This led to the launch of the Pro Clima trademark in 1994 and a full range of professional products to achieve an airtight building strategy. Lothar’s focus was to support the Pro Clima range with technical information, documentation, training materials and provide guest lecturing regarding airtightness to both national and international markets.

At the beginning of the millennium Pro Clima introduced a new range of monolithic non-porous and highly vapour diffusion open roofing and wall lining membranes. Unlike conventional micro porous membranes, monolithic membranes actively transport vapour out of building elements more reliably.  In 2004 the high-performance INTELLO PLUS Intelligent Airtight Vapor Control membrane set new standards for protection from mold and decay in construction. Today Pro Clima develops and distributes climate-adapted building envelopes and sealing systems in more than 30 countries worldwide (with subsidiaries in New Zealand and Australia) and continues to research specific sustainable solutions for the performance and requirements of the building envelope systems of the future.

Email us at info@foursevenfive.ca for complete schedule details and to reserve your spot.

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