External wall insulation is often considered to be more effective than other insulation systems. The external cladding, which may be decorative too, can basically prevent the walls from getting unusually warmed up or too cold and hence there is a consequential impact on energy consumption. If walls do get heated up or excessively cold then drywall insulation or other systems do fail to offer impeccable thermal proofing. External wall insulation can be of mineral wool, expanded polystyrene, phenolic foam or polyurethane foam. There may be reinforced cement, plaster, synthetic or mineral finish.
• External wall insulation should be thick enough to effectively thermal proof the building. It is not possible for such kind of a system to be partial in its application or installation. Such insulation systems must cover the entire building, unless there is a specific need to insulate one particular room or area. Experts recommended a partition that will assure U=0.25-0.3 W/m2K heat transmission factor. There are many other considerations that should influence the choice of material and the type of external wall insulation.
• Always adhere to the local building regulation standards. Find out what the rules are right now. Do not presume and do not go with unverified opinions. Ideally, the insulation company and the installers will guide you throughout the process but it is helpful if you are yourself aware of the applicable legal statutes.
• External insulation is a bit of a challenge in comparison with internal insulation. This is simply because the material installed outside will be exposed to inclement weather. Rains, storms, strong winds, sunlight and other natural threats will pose a great risk. You cannot have any part of the insulated wall to have even the tiniest leaks, gaps or unsealed seams. There cannot be any eaves that are effectively uncovered wherefrom you would have moisture or water seep in and that shall be trapped inside the wall. This moisture is difficult to get rid of and it will cause structural damage.
• Durability of external wall insulation should be prioritised. It is not just about the thermal proofing and weather proofing but also how long the same attributes will remain effective. Deterioration or degradation is more common with external insulation than a system that remains concealed within walls. It is true that external systems work better and are also environment friendly but they make more rational sense only when they do not deteriorate in just a few years.