It also booked a 25 million pound charge on the back of Carillion's liquidation for the six months ended December 31, 2017, with first-half earnings per share falling 9 percent to 56.3 pence per share.
The company said Rothschild would be acting as advisor on the capital raising.
Shares in the FTSE 250-listed housebuilding and construction firm were down 14% to 845.50 pence in morning trade in London on Wednesday, having opened at a new 52-week low of 822.50p.
The company said Carillion's demise has increased its cash commitments on a joint venture by more than £150mln.The joint venture, which also includes Balfour Beatty plc (LON:GFRD), is for the Aberdeen Western Peripheral Route road project.
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Proceeds will go towards strengthening the group's balance sheet and ensuring that has enough capital to meeting its growth targets for the "Strategy to 2021" plan.
It therefore said it would aim to raise £150m from investors, fully underwritten by Peel Hunt and HSBC.
While the group pre-tax profit figure was down 11% on a year ago, net debt was also substantially reduced from £113.8m to £84.9m. Of this, Partnerships & Regeneration saw the highest rate of growth, with a 55% revenue rise to GBP223.5 million from GBP144.3 million the year before.
Galliford Try declared a dividend of 28.0 pence per share, down 13% from 32.0p the year before, as the group brings forward its planned increase in dividend cover to two times the earnings per share before one-off costs, effective for the current financial year. It had previously predicted a hit of £40m relating to the Carillion collapse, and charged £25m of this to its first-half results.
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Galliford Try chief executive Peter Truscott said it had a "solid foundation to build on" amid "strong fundamentals for the housing market" though acknowledging political uncertainty.
"We have reviewed the impact on our business from the compulsory liquidation of Carillion, which has resulted in a further reassessment of the likely out-turn from our participation in the Aberdeen Western Peripheral Route joint venture, leading to an exceptional charge of GBP25 million".
The firm has announced it will raise an extra £150m worth of capital in an attempt to offset the "additional financial obligations arising from [the AWPR] contract".
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However, there was a significant correlation for higher baseline levels of PFAS with greater weight regain, especially in women.