Snow pattern shows no loss of heat.
Somethings are out of site, out of mind. It isn’t an easy task to climb up in the attic and see what is going on with the distribution of insulation or if there is an attic box not siting just right. Melted snow patterns can indicate potential areas of poor insulation and house looseness. This morning we had our first light dusting of snow with some additional snow being predicted for the weekend. Looking at how the snow melts on a roof can be a good indicator of some potential missed opportunities for conserving on fuel and being able to maintain consistent temperatures in the house.
Here are few pictures I took this morning. The first picture shows snow evenly distributed with no bare spots. This is a good indicator that there is minimal leakage of heat around the tunnel inlet curtain, the attic boards are closed, and the insulation is intact. The second picture shows melted snow on the tunnel inlet dog box roof metal. This indicates there is leakage around the tunnel inlet. The inlet area may not be fully closed due to the tunnel inlet being poorly sealed. The third picture shows a melted spot on the roof that is about half way down the dog box. This would indicate a possible attic door not being closed or that the insulation is not intact. In this particular instance, the insulation has been compromised in an area just above a heater. The ceiling material was replaced but the insulation was not and there is an area of the curtain that is not fully meeting up fascia board due to shrinkage. Identifying these issues and correcting them in a timely manner, will improve performance by improving bird comfort, floor conditions. and reduce fuel usage.
Melted snow at the tunnel curtain shows areas of heat being lost.
Melted snow in an area where insulation is not intact.
This is one of three grower field workshops the University of Delaware recently conducted for area poultry growers. A local integrator partnered with UD’s poultry team to provide hands-on education on topics like Winter Ventilation and Litter Management, Litter Reconditioning and Nipple Drinker Management. Other training included animal welfare and food safety. Here are some of the pictures from our most recent session:
A Delmarva poultry house serves as a classroom
Steven Collier left and I (Bill Brown) right, demonstrate house leakage principles using colored water:
Greg Griffith, regional sales manager for Ivesco, demonstrates how to seal a foundation plate to improve ventilation and avoid drafting birds:
Here, I am demonstrating the importance of insulation in reaching the required R values to reduce heat transfer and condensation. This is another ventilation basic:
Knowing the correct R value for your poultry house is crucial
My colleague, Steven Collier uses a smoke stick to visualize the movement of air through mixing fans while I explain the heat stratification and how mixing fans improve fuel cost and litter conditions:
In this last photo, you see I am holding a sponge. This exercise demonstrates the moisture holding properties of air in a chicken house as it is heated. This is another ventilation basic. (You will notice the smoke from the aforementioned smoke test had not yet settled!):
Posted by MDW on behalf of Bill Brown, UD poultry Extension agent