1

Signed agreement to acquire global brand leader of cellular glass

insulation and accessory products for approximately $560MM in cash,

on a cash-free and debt-free basis, subject to regulatory approvals

Consistent with Insulation business strategy of geographic and product

technology extension

Value contributors:

o

Broadens range of attractive industrial & commercial applications

o

Adds strong and stable margins through the cycle

o

Significantly strengthens our global Insulation platform

o

Leverages OC core glass technology strength

Business delivered revenue of over $240MM in 2016 and adjusted

EBITDA margins in a 25%-27% range over last 4 years

Expect acquisition to be accretive to 2017 EPS, excluding transaction

and integration costs

Anticipate a run rate of $20MM of operational and commercial synergies

by mid-2019

Sources:

Owens Corning SEC filings; management estimates and press release issued May 15, 2017

Pittsburgh Corning Acquisition

Strengthens Position of Insulation Business

Exhibit 99.1