Amendment Agreement, dated February 2, 2018 related to the Purchase Agreement, dated October 27, 2017, by and among Owens Corning Finland Oy, Parry Investment S.A. and the individuals party thereto

PARRY INVESTMENTS S.A.

THE WARRANTORS (AS DEFINED HEREIN)

OWENS CORNING FINLAND OY

PAROC GROUP OYJ

PARRY 1 HOLDING AB

PROJECT PARRY JERSEY LIMITED

PAROC OY AB

PARRY INVESTMENTS S.A., a limited liability company, incorporated under the laws of Luxembourg and having its registered office at 20 Avenue Monterey, L/2163 Luxembourg and registered under number B194.003 (the "Seller");

The persons whose names are set out in Schedule A of the SPA (the "Warrantors"); and

OWENS CORNING FINLAND OY, a limited liability company incorporated and existing under the laws of Finland and having its registered office at c/o Asianajotoimisto Borenius Oy, Etelaesplanadi 2, 00130 Helsinki, Finland and registered under number ###-###-####-6 (the "Buyer"),

PAROC GROUP OYJ, a public limited company incorporated and existing under the laws of Finland and having its registered office at PL 240 00181 Helsinki, Finland and registered under number ###-###-####-6 ("Paroc Group");

PARRY 1 HOLDING AB, a limited liability company incorporated under the laws of Sweden and having its registered office at 541 86, Skövde, Sweden and registered under number ###-###-#### (the "Company");

PROJECT PARRY JERSEY LIMITED, a company incorporated under the laws of Jersey and registered under number 117679 ("Parry Jersey"); and

PAROC OY AB, a private limited liability company incorporated and existing under the laws of Finland and having its registered office at PL 240 00180 Helsinki, Finland and registered under number ###-###-####-9 ("Paroc Oy AB").

On 27 October 2017, the SPA Parties entered into a share sale and purchase agreement (the "SPA") for the sale and purchase of the entire issued share capital of the Company.

In accordance with Section 14.8 of the SPA, the SPA Parties wish to amend the SPA and the SPA Parties and the Parties wish to record their agreement on certain matters in relation to the SPA on the terms of this Agreement.

Except where specified otherwise or where the context otherwise requires, terms defined in the SPA bear the same meaning in this Agreement and the provisions of Section 1 of the SPA shall apply on an equivalent basis to this Agreement.

As used in this Agreement the following capitalised terms have the following meaning:

The wording of the definition of 'Closing Date' at Section 1.19 of the SPA shall be deleted in its entirety and replaced with the following wording:

The wording of the definition of 'Existing Debt Facilities' at Section 1.42 of the SPA shall be deleted in its entirety and replaced with the following wording:

A new defined term of "Factoring Agreements" shall be added as a new Section 1.44A of the SPA which shall be defined as follows:

The wording of the definition of 'Release Documents' at Section 1.90 of the SPA shall be deleted in its entirety and replaced with the following wording:

The following sub-paragraph shall be added as a new Section 5.1(b)(vii) of the SPA:

The wording of Section 5.3(b)(i) of the SPA shall be deleted in its entirety and replaced with the following wording:

The wording of Section 5.3(f)(iv) of the SPA shall be deleted in its entirety and replaced with the following wording:

The wording of Section 7.1(d) of the SPA shall be deleted in its entirety and replaced with the following wording:

The wording of Section 14.1(iii) of the SPA shall be deleted in its entirety and replaced with the following wording:

Seller confirms that:

none of Paroc Polska Sp. z o.o., AS Paroc, SIA Paroc and UAB Paroc has issued share certificates; and

the share certificate issued by Paroc Group represents only issued share numbers 1 - 2,500 in Paroc Group and therefore does not represent all of the issued shares in Paroc Group (the interests being held in the Group Companies referred to in sub-clause 3.1 (A)a above and the uncertificated interests representing share numbers 2,501 - 47,500,000 in Paroc Group together being the "Uncertificated Interests"); and

Buyer confirms that, provided that the Seller's statements in sub-clause 3.1 (A) above are true and accurate, it does not require an original or certified copy of any share certificate in respect

The Parties acknowledge and agree the following, and the SPA Parties acknowledge and agree that, subject to clause 4.2, receipt of all relevant amounts pursuant to the transfers contemplated by this clause 4.1 shall be deemed to satisfy Buyer’s obligations under Sections 3(b), 7.1(c), 7.1(d) and 7.1(e) of the SPA:

Before, and in anticipation of, Closing, Buyer will make the following transfers of funds:

a transfer of the sum of €424,348,881.59 (the "Aggregate Purchase Price Amount") to Seller, representing the Purchase Price calculated on the assumption that Closing occurs on 5^th February 2018, such Aggregate Purchase Price Amount to be paid to the bank account of Seller set out in the Appendix to this Agreement (the "Seller Account");

a transfer of the sum of €439,327,020.84 (the "Aggregate Term Debt Amount") to Paroc Group, representing (i) the portion of the Release Amount relating to the Existing Term Debt calculated on the assumption such pay-off funds are received by the Agent at or before the Prepayment Time on 5^th February 2018 plus (ii) an amount of €57,229.17, being the portion of the additional interest that would be payable under the Senior Facilities Agreement in relation to the Existing Term Debt if such pay-off funds are received by the Agent after the Prepayment Time on 5^th February 2018 but at or before the Prepayment Time on 6^th February 2018, such Aggregate Term Debt Amount to be paid to the bank account of Paroc Group set out in the Appendix to this Agreement (the "Paroc Group Account");

a transfer of the sum of €5,116,969.22 (the "Aggregate Revolving Debt Amount") to Paroc Oy AB, representing (i) the portion of the Release Amount relating to the Existing Revolving Debt calculated on the assumption such pay-off funds are received by the Agent at or before the Prepayment Time on 5^th February 2018 plus (ii) an amount of €3,331.89, being the portion of the additional interest that would be payable under the Senior Facilities Agreement in relation to the Existing Revolving Debt if such pay-off funds are received by the Agent after the Prepayment Time on 5^th February 2018 but at or before the Prepayment Time on 6^th February 2018, such Aggregate Revolving Debt Amount to be paid to the bank account of Paroc Oy AB set out in the Appendix to this Agreement (the "Paroc Oy AB Account"); and

a transfer of the sum of €51,249,221.52 (the "Aggregate Intercompany Debt Amount") to the Company, representing the Project Parry Existing Intercompany Loan Amount (as defined in the SPA) calculated on the assumption that Closing occurs on 5^th February 2018, such Aggregate Intercompany Debt Amount to be paid to the bank account of the Company set out in the Appendix to this Agreement (the "Company Account").

Paroc Group hereby covenants and undertakes to Buyer that, immediately upon receipt of the SWIFT confirmation relating to the transfer of the Aggregate Term Debt Amount from Buyer, it shall give irrevocable instructions to the relevant bank (and shall take such other actions (if any) as Buyer may reasonably request) to transfer the Aggregate Term Debt Amount to the bank account of the Agent set out in the Appendix to this Agreement (the "Agent Account"), and that until such time as such transfer has been made, it shall (i) hold the Aggregate Term Debt Amount to the order of Buyer and (ii) not use, dispose of or apply the Aggregate Term Debt Amount for any purpose other than to comply with its obligations under this sub-clause (B) or clause 4.4.

Paroc Oy AB hereby covenants and undertakes to Buyer that, immediately upon receipt of the SWIFT confirmation relating to the transfer of the Aggregate Revolving Debt Amount from Buyer, it shall give irrevocable instructions to the relevant bank (and shall take such other actions (if any) as Buyer may reasonably request) to transfer the Aggregate Revolving Debt Amount to the Agent Account, and that until such time as such transfer has been made, it shall (i) hold the Aggregate Revolving Debt Amount to the order of Buyer and (ii) not use, dispose of or apply the Aggregate Revolving Debt Amount for any purpose other than to comply with its obligations under this sub-clause (C) or clause 4.4.

The Company hereby covenants and undertakes to Buyer that, immediately upon receipt of the SWIFT confirmation relating to the transfer of the Aggregate Intercompany Debt Amount from Buyer, it shall give irrevocable instructions to the relevant bank (and shall take such other actions (if any) as Buyer may reasonably request) to transfer the Aggregate Intercompany Debt Amount to the bank account of Parry Jersey referred to in the Appendix to this Agreement (the "Parry Jersey Account"), and that until such time as such transfer has been made, it shall (i) hold the Aggregate Intercompany Debt Amount to the order of Buyer and (ii) not use, dispose of or apply the Aggregate Intercompany Debt Amount for any purpose other than to comply with its obligations under this sub-clause (D) or clause 4.4.

Unless otherwise agreed in writing by Seller, if Closing (as defined in the SPA) does not occur on 5th February 2018 then before, and in anticipation of, Closing on 6^th February 2018:

Buyer will make the following transfers of funds:

a transfer of the sum of €12,651.81 (the "Additional Purchase Price Amount") to Seller, representing the agreed net amount payable in addition to the Aggregate Purchase Price Amount if the Purchase Price is calculated on the assumption that Closing occurs on 6th February 2018, such Additional Purchase Price Amount to be paid to the Seller Account; and

a transfer of the sum of €13,903.75 (the "Additional Intercompany Debt Amount") to the Company, representing the amount payable in addition to the Aggregate Intercompany Loan Amount if the Project Parry Existing Intercompany Loan Amount is calculated on the assumption that Closing occurs on 6th February 2018, such Additional Intercompany Debt Amount to be paid to the Company Account; and

the Company hereby covenants and undertakes to Buyer that, immediately upon receipt of the SWIFT confirmation relating to the transfer of the Additional Intercompany Debt Amount from Buyer, it shall give irrevocable instructions to the relevant bank (and shall take such other actions (if any) as Buyer may reasonably request) to transfer the Additional Intercompany Debt Amount to the Parry Jersey Account and that, until such time as such transfer has been made, it shall (i) hold the Additional Intercompany Debt Amount to the order of Buyer and (ii) not use, dispose of or apply the Additional Intercompany Debt Amount for any purpose other than to comply with its obligations under this sub-clause (B) or clause 4.4,

Seller covenants and undertakes to Buyer that, following receipt of the funds transferred to it pursuant to clause 4.1 (A)a and/or clause 4.2 (A)a above, it will (i) hold the Aggregate Purchase Price Amount and, if applicable, the Additional Purchase Price Amount to the order of Buyer and (ii) not use, dispose of or apply the Aggregate Purchase Price Amount or, if applicable, the Additional Purchase Price Amount for any purpose other than to comply with its obligations under clause 4.4; and

Parry Jersey covenants and undertakes to Buyer that, following receipt of the funds transferred to it pursuant to clause 4.1 (D) and/or clause 4.2 (B), it will (i) hold the Aggregate Intercompany Debt Amount and, if applicable, the Additional Intercompany Debt Amount to the order of Buyer and (ii) not use, dispose of or apply the Aggregate Intercompany Debt Amount or, if applicable, the Additional Intercompany Debt Amount for any purpose other than to comply with its obligations under clause 4.4.

If Closing does not occur by 1.00 p.m. (UK time) on 6^th February 2018 then, unless otherwise agreed in writing by Buyer, as soon as reasonably practicable thereafter and in any event by no later than 5.00 p.m. (UK time) on 6^th February 2018:

to the extent that Seller received the Aggregate Purchase Price Amount or Additional Purchase Price Amount, Seller undertakes to give irrevocable instructions to the relevant bank to repay to Buyer an amount equal to the Aggregate Purchase Price Amount and (if transferred to it pursuant to clause 4.2) the Additional Purchase Price Amount (in each case, net of interest costs or charges and other fees paid or payable by Seller), such payment to be made to the Buyer Account;

to the extent that Paroc Group holds the Aggregate Term Debt Amount, Paroc Group undertakes to give irrevocable instructions to the relevant bank to repay to Buyer an amount equal to the Aggregate Term Debt Amount (net of interest costs or charges and other fees paid or payable by Paroc Group), such payment to be made to the Buyer Account;

to the extent that Paroc Oy AB holds the Aggregate Revolving Debt Amount, Paroc Oy AB undertakes to give irrevocable instructions to the relevant bank to repay to Buyer an amount equal to the Aggregate Revolving Debt Amount (net of interest costs or charges and other fees paid or payable by Paroc Oy AB), such payment to be made to the Buyer Account;

to the extent that the Company holds the Aggregate Intercompany Debt Amount or the Additional Intercompany Debt Amount, the Company undertakes to give irrevocable instructions to the relevant bank to repay to Buyer an amount equal to the Aggregate Intercompany Debt Amount and (if transferred to it pursuant to clause 4.2) the Additional Intercompany Debt Amount (in each case, net of interest costs or charges and other fees paid or payable by the Company), such payment to be made to the Buyer Account; and

to the extent that Parry Jersey holds the Aggregate Intercompany Debt Amount or the Additional Intercompany Debt Amount, Parry Jersey undertakes to give irrevocable instructions to the relevant bank to repay to Buyer an amount equal to the Aggregate Intercompany Debt Amount and (if transferred to it pursuant to clause 4.2) the Additional Intercompany Debt Amount (in each case, net of interest costs or charges and other fees payable by Parry Jersey), such payment to be made to the Buyer Account.

Seller warrants to Buyer that the statements set out in Sections 8.3(a) and 8.3(e) of the SPA are true, correct and not misleading (in the case of Section 8.3(e), in respect of this Agreement only) as at the date of this Agreement.

Buyer warrants to Seller that the statements set out in Sections 9.1 and 9.2 of the SPA are true, correct and not misleading (in the case of Section 9.2, in respect of this Agreement only) as at the date of this Agreement.