Construction Law

Application Tips for Vertical Underlayment Installations Part 2 featured image

Application Tips for Vertical Underlayment Installations Part 2

In part one of this two-part series, the Tallahassee construction law attorneys at Cotney Attorneys & Consultants discussed the importance of minimizing heat exposure when installing underlayments and provided some tips for successful installations. Now, we will cover some other important factors related to vertical applications.

Building Codes

Despite the fact that self-adhering underlayments have been used for over 30 years, new application methods should still consider existing building codes before installation. You should know the relevant building codes related to sidewall applications and the manufacturer’s preferred or recommended installation method. Additionally, contractors should be cognizant of the temperature and UV exposure ratings that must be observed during installation as building defects can lead to litigation requiring the services of a Tallahassee construction law attorney.

Product Approvals

Only use certified self-adhered underlayments. Compliance with industry standards is integral to a successful underlayment installation. If you are using a product that doesn’t meet the pertinent codes, the performance of your underlayments may not meet the necessary benchmarks.


Before you install an underlayment, you must confirm that the substrate is clean, dry, and void of waxes, dirt, or debris. Failure to ensure that these criteria are satisfactorily met is imperative, otherwise, the adhesive properties of the underlayment will be mitigated. If a surface has experienced significant weathering, you will need to apply a primer before installation.

Removing Gaps

Never utilize the underlayment to cover gaps in the substrate. This will compromise the weather-proofing properties of your underlayment. Instead, you can use a flashing membrane or tape to effectively seal any of these gaps prior to the installation of the underlayment.

Caulks and Sealants

It’s also important that you avoid using any caulks and sealants containing plasticizers. If you aren’t careful, the adhesive properties of your underlayment could be compromised since plasticizers can cause the mastic to liquefy. Contractors should be cognizant of the compatibility of their caulks and sealants.

Apply Pressure

Of course, whenever you apply any sort of adhesion to fasten two different surfaces together, you will want to apply substantial pressure over the entire surface area focusing especially on overlapping areas.

If you would like to speak with a Tallahassee construction law attorney, please contact us today.

Disclaimer: The information contained in this article is for general educational information only. This information does not constitute legal advice, is not intended to constitute legal advice, nor should it be relied upon as legal advice for your specific factual pattern or situation.