THE PURPOSES OFROOF UNDERLAYMENT

VHBR

OOFIN

G.CO

M

MOST ROOF MATERIALS AREACTUALLY NOT WATERPROOF, ONLYWATER-RESISTANT. THUS, THEMATERIALS HAVE TO BE INSTALLEDON TOP OF A WATERPROOF LAYER,OR WHAT IS CALLED THE"UNDERLAYMENT."

ROOF UNDERLAYMENT IS THESECONDARY BARRIER TO OUTSIDEELEMENTS.

WATERPROOF UNDERLAYMENTPREVENTS THE PASSAGE OF LIQUIDWATER AND WATER VAPOR.

UNDERLAYMENT ALSO PROVIDESTEMPORARY PROTECTION FOR NEWHOMES AND NEW CONSTRUCTIONBEFORE ROOFING MATERIALS AREADDED ON TOP.

UNDERLAYMENT ASSISTS IN FIRERESISTANCE KEEPING WOOD ROOFSFROM BEING AS SUSCEPTIBLE TOFIRE AND IMPROVING THE OVERALLFIRE RATING.

UNDERLAYMENT WAS NOT ALWAYSREQUIRED IN THE PAST BY BUILDINGCODES, SO OLDER HOMES ANDBUILDINGS MAY NOT HAVEUNDERLAYMENT OR THE QUALITYOF UNDERLAYMENT TODAY.

JUST LIKE TILES AND SHINGLES,UNDERLAYMENT NEEDS TO BEINSPECTED, REPAIRED ANDUPDATED TO KEEP YOUR ROOF SAFEAND PROTECTED.

FOR MORE INFO, VISITVHBROOFING.COM